Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c51b78104367f8…

MALICIOUS

PDF

44.9 KB Created: 2020-08-21 04:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9df0e54a301a1b214f9735df0fda4b4 SHA-1: afd257f1ce02c8cd16f11f55e07caadf7a9ff826 SHA-256: 72c51b78104367f808389847f531bc58d90a6b4c24f24377c7929b83f3216987
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that aligns with this malicious redirection. The presence of numerous external PDF links, many pointing to benign Shopify URLs but some to unknown domains, suggests a link farm SEO tactic to obscure the malicious redirector.

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 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.
  • 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=ecologia+e+educa%25C3%25A7%25C3%25A3o+ambiental+pdf
    • http://lolivi.krisspanglermft.com/uploads/1/3/0/7/130739860/gowazezinigadulon.pdf
    • http://files.armadafootball.com/uploads/1/3/0/7/130739404/1920493.pdf
    • http://files.windsweptwillow.com/uploads/1/3/0/7/130740571/4c9ca.pdf
    • http://files.edwardfanphotos.com/uploads/1/3/1/8/131857120/fonuguxeduseb.pdf
    • http://zuxitavud.tmcromwell.com/uploads/1/3/1/6/131637308/xosejibawotewev_raregugasijuke_xivejanasimuwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/4336/0663/files/calendario_octubre_2020_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/75732940625.pdf
    • https://cdn.shopify.com/s/files/1/0457/6237/9940/files/60194264060.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/candidiase_de_repetio_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6808/files/fuvasadusodesamugikore.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/lolawexogibalanurewigafes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6483/files/jazotajokik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3855/5805/files/jowabaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/foxomimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2976/6045/files/wenazemegufukik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/office_2016_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/6718/7108/files/multiplication_word_problems_worksheets_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4918/files/telosumu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c50.bin
1213770df031d78477c354ef6c60d54dcfb6a26bfbf77cabc4045f7a9db13e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 5796 bytes
font_01_sfnt_off00007f17.bin
27ba523fffbeb667d392037f2b0d9aa920ee64f0b52ba7e582a4d7cb28b28c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F17 12316 bytes

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