Malicious PDF — malware analysis report

Static analysis result for SHA-256 f131eb405d9757ef…

MALICIOUS

PDF

38.0 KB Created: 2020-10-08 15:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8bc4ece27888f30e3cd1112fb5359db0 SHA-1: 91c1b0b80d9fbd0cec72399229c0b58cf6814fde SHA-256: f131eb405d9757ef3b98e6386420c069c320ddcd6e61afd649ed65fa19c06f4c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a known malicious URL, indicating an attempt to lure the user to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs, further supporting the 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://ttraff.club/pify?keyword=pruning+made+easy+peter+mchoy In PDF document text
    • http://files.allysonkellum.com/uploads/1/3/1/3/131379443/xutujugifades.pdfIn PDF document text
    • http://jezagejoz.idahobarrelfuturity.com/uploads/1/3/2/6/132695388/8793930.pdfIn PDF document text
    • http://files.salemstitches.com/uploads/1/3/1/3/131382786/ladara_fomewa_bamipekadanapiv.pdfIn PDF document text
    • https://site-1036955.mozfiles.com/files/1036955/29816415587.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/19887542015.pdfIn PDF document text
    • https://site-1045312.mozfiles.com/files/1045312/25182532553.pdfIn PDF document text
    • https://site-1044154.mozfiles.com/files/1044154/xekukoruvovatewaxolazu.pdfIn PDF document text
    • https://site-1038974.mozfiles.com/files/1038974/bupetel.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/1/0430/8015/5290/files/jiwexuxew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0009/3083/files/drucker_and_falk_careers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2922/0504/files/probability_and_counting_rules_chapter_4_solutions.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_off0000498c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x498C 5440 bytes
SHA-256: 69ff2c16e7b46171e75c8cd285f1566bbdeb1dd7e3fce955b49e2d7df0c78efd
font_01_sfnt_off00005bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD8 9780 bytes
SHA-256: b2c177acaf81dd4fe816aa144975f911aa708d39f607ebdf6b38753370e67f94
font_02_sfnt_off00007d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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