Malicious PDF — malware analysis report

Static analysis result for SHA-256 013a0334be3a3116…

MALICIOUS

PDF

50.6 KB Created: 2020-10-31 14:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 344d5d2544ee9014f40e83de53a58c9e SHA-1: b88e7307c5e2f995136006776e075737f2aba912 SHA-256: 013a0334be3a31167bb4f6966db03224ed18dd6f9756cbf1d673de2b4a76889c
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector: https://gettraff.ru/aws?keyword=countdown+to+classic. The document body, though heavily obfuscated, contains text related to 'Countdown to classic' and the authoring application 'wkhtmltopdf', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://gettraff.ru/aws?keyword=countdown+to+classic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5f9c8d4ec16fd.pdfIn PDF document text
    • https://tidivexosito.weebly.com/uploads/1/3/4/3/134316292/tawativarabudowoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5f94ae12d637e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f9a920c6fda6.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/9338043.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/3ad5fa11.pdfIn PDF document text
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/tepolibul_bovumobu.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/1517746.pdfIn PDF document text
    • https://zatajiwivovib.weebly.com/uploads/1/3/4/5/134529671/5896fb91c1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/gofizozixuzoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8feb1a22-dd3b-4e28-b323-f541cf6d0939/40427757029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8415/1452/files/the_seven_lady_godivas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f834d63-d638-4550-a613-b8e6b69d4f69/70246372637.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8800 4832 bytes
SHA-256: 6acd921297e9d5c1d7acbb24403cfc1a72bbc92d60daa4fe273a40eb61617a34
font_01_sfnt_off0000988e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x988E 10884 bytes
SHA-256: d440eda6e83eb0665a4d892473975f8cc1a91f72b2dbff0f1648a40505266864

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