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)
MD5: 42c2ea39d27d6d85a77c69f9b85ef805 SHA-1: cf24eeb88335ba2f13dd21f493ae7af6677e0912 SHA-256: f4b0fe50275288292d1b8e3c29524e51bcd460e14196704471a8ba4b77c3ffa6
120 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.

Heuristics 3

  • 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.
  • 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
    • http://files.tammylynnhenderson.com/uploads/1/3/0/8/130874683/malojel.pdf
    • http://files.stjohnlutheransherburn.org/uploads/1/3/1/8/131856134/kutapolazovese.pdf
    • http://files.runforryanoehl.com/uploads/1/3/2/6/132681969/momemaxupef.pdf
    • http://files.sonjanagy.com/uploads/1/3/1/3/131384635/3023831ee0.pdf
    • http://files.surfacesolutionsnmore.com/uploads/1/3/0/8/130874493/3464160.pdf
    • https://cdn.shopify.com/s/files/1/0435/9258/1288/files/67896070625.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/nowesopegitudugoliz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/8638199050.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/pomufuxugoxadatevosage.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/lojozaxanipilonenusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/56135862203.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0185/files/vulikagok.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/diner_das_flo_on_the_go.pdf
    • https://cdn.shopify.com/s/files/1/0435/3966/0954/files/metropolitan_opera_rush_tickets.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/jemonaxiguxero.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/jofodifukafuxewamazitarel.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/international_financial_management_eun_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/0325/4683/files/t25_dynamic_core.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009905.bin
0aac26e2cfef0e4797c3c29c701724ca36335bd145deaf488e7fc06accc81c23
pdf-font-stream PDF embedded font (sfnt) at offset 0x9905 5156 bytes
font_01_sfnt_off0000aa94.bin
482cf3f10aaf75eabd49cd179202849c22f6a1ec446aa31751224319d54681ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA94 10456 bytes
font_02_sfnt_off0000ce57.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 4324 bytes