Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bb3ff9cf8b037a…

MALICIOUS

PDF

72.9 KB Created: 2020-10-26 01:53:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b5d2333d796b30512177a3ee61392cba SHA-1: 965f218c847e7e11413ba4c400d2f4f39932c13c SHA-256: 76bb3ff9cf8b037ae9c2ee2461449b4fc1c6831f10591d43ffc8188eb774488c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which are hosted on disposable domains and point to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary malicious URL identified is https://cctraff.ru/123?keyword=geisha+setengah+hatiku+tertinggal+mp3+wapka, which is likely used to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?keyword=geisha+setengah+hatiku+tertinggal+mp3+wapka In PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/8657434.pdfIn PDF document text
    • https://gemefakopegixi.weebly.com/uploads/1/3/4/3/134309359/boxarirazis_kefokobetinow_fewozud_jifawukazoj.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/dekefomivupe-kovak-talajonipa-fedebiraroz.pdfIn PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/dasuxowezofuged-pakakin-dixogonep-wutufavejij.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/8e8e631ef56a.pdfIn PDF document text
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/3739144.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/jogejutitato.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/9173669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/74a9c004-0abe-476d-81f1-8776e3469057/john_lewis_spectrum_dab_fm_portable_digital_shower_radio_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5819a47d-9fb8-4379-9dd1-ddfe3b44bbc3/jimukasubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbdc481c-e10c-4b65-b52f-db97958f8e04/statistical_analysis_system_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423efb7d-58ce-44d6-9d1d-bca8665c2723/volasegejivokip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de42d794-aca2-4abf-872d-50d510dbe5ac/ralezavisezuzex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2680/8484/files/nafozalomapofebinajodaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4377/7433/files/ruzezimanamij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/9762/6021/files/27277562050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff8e2df4-424a-4f5b-af35-33ebd2cbef3e/icd_10_sensory_processing_disorder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40f02d39-ba59-4e79-a1e6-1d8a4e9ee98d/xokebanijasubigulimewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd349333-2bd4-456c-bcf7-414925654e7d/96167612598.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA457 5356 bytes
SHA-256: e67477597d5e910d89e40990a2ecc94800bcfb49e79fee60d421027364747f7f
font_01_sfnt_off0000b66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 19112 bytes
SHA-256: 55fd254d77aa651bc0a57eab9d4294f28d7e10d111a3a94a25efa4791e8e6a5c
font_02_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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