Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f64477fc766fdcb…

MALICIOUS

PDF

45.6 KB Created: 2020-10-02 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4bf1dfe3a5eee1f23bc97128e768d43a SHA-1: e2eeeba8d049817934e42610ef32d1109f471bf0 SHA-256: 1f64477fc766fdcb3dea8e125e31c700891deb67f3f23a0747cbd647697d62da
184 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One link points to known malicious redirector infrastructure, and many others are part of a link farm hosted on disposable domains. The document body contains garbled text and what appears to be metadata, but the primary malicious function is the redirection to external URLs.

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/pify?keyword=melf%2527s+minute+meteors+sage+advice In PDF document text
    • http://files.localzak.com/uploads/1/3/0/8/130813922/c9a545.pdfIn PDF document text
    • http://files.equusmedendi.com/uploads/1/3/0/8/130874034/b3bce373.pdfIn PDF document text
    • http://files.arkansasyouthconference.org/uploads/1/3/0/7/130739982/dujosa.pdfIn PDF document text
    • http://zopute.petersenchuk.com/uploads/1/3/1/4/131407395/talat_bewovas_vimujejapozo_foluga.pdfIn PDF document text
    • http://silefe.jihyunhong.com/uploads/1/3/0/8/130814687/zizeginomuxavegi.pdfIn PDF document text
    • http://files.benhamu.com/uploads/1/3/2/6/132681647/suwefugex.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/53286134702.pdfIn PDF document text
    • https://site-1036702.mozfiles.com/files/1036702/64052309733.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/judapu.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/wasaxisinadutud.pdfIn PDF document text
    • https://site-1039489.mozfiles.com/files/1039489/nupibofogunogujujotuzoneb.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://cdn.shopify.com/s/files/1/0431/8344/0030/files/xafeziwumafawomok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0253/4822/files/rose_gold_braid_cuffs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E8 5324 bytes
SHA-256: 63d96d23b36cbc1b8bc3c6499a401eb5b075b52341f24660bf293b7e58f4de43
font_01_sfnt_off000077f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F9 10352 bytes
SHA-256: f793e50402b760497ef60410bb59bf163fae1edc374a9bf29ffcef3e089a9af7
font_02_sfnt_off00009b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B70 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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