Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b0fe5027528829…

MALICIOUS

PDF

58.5 KB Created: 2020-08-03 16:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 42c2ea39d27d6d85a77c69f9b85ef805 SHA-1: cf24eeb88335ba2f13dd21f493ae7af6677e0912 SHA-256: f4b0fe50275288292d1b8e3c29524e51bcd460e14196704471a8ba4b77c3ffa6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link farm and a direct link to a known malicious redirector, 'https://ttraff.ru/pify?keyword=zensar+aptitude+questions+with+answers+pdf'. The document body, though heavily obfuscated, contains text related to 'Zensar aptitude questions', suggesting a lure to disguise the malicious link. The presence of numerous embedded URLs pointing to external PDFs indicates a link farm designed to improve search engine ranking for malicious content or to distribute further payloads.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.ru/pify?keyword=zensar+aptitude+questions+with+answers+pdf In PDF document text
    • http://files.tammylynnhenderson.com/uploads/1/3/0/8/130874683/malojel.pdfIn PDF document text
    • http://files.stjohnlutheransherburn.org/uploads/1/3/1/8/131856134/kutapolazovese.pdfIn PDF document text
    • http://files.runforryanoehl.com/uploads/1/3/2/6/132681969/momemaxupef.pdfIn PDF document text
    • http://files.sonjanagy.com/uploads/1/3/1/3/131384635/3023831ee0.pdfIn PDF document text
    • http://files.surfacesolutionsnmore.com/uploads/1/3/0/8/130874493/3464160.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/1/0435/9258/1288/files/67896070625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/nowesopegitudugoliz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/8638199050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/pomufuxugoxadatevosage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/lojozaxanipilonenusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/56135862203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5630/0185/files/vulikagok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/diner_das_flo_on_the_go.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/metropolitan_opera_rush_tickets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/jemonaxiguxero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/jofodifukafuxewamazitarel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/international_financial_management_eun_7th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0325/4683/files/t25_dynamic_core.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_off00009905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9905 5156 bytes
SHA-256: 0aac26e2cfef0e4797c3c29c701724ca36335bd145deaf488e7fc06accc81c23
font_01_sfnt_off0000aa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA94 10456 bytes
SHA-256: 482cf3f10aaf75eabd49cd179202849c22f6a1ec446aa31751224319d54681ff
font_02_sfnt_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71