Malicious PDF — malware analysis report

Static analysis result for SHA-256 168e322b5e2a78dd…

MALICIOUS

PDF

40.3 KB Created: 2020-08-11 13:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3079d3a576a1f34e5bd18ff57f651741 SHA-1: 3d768e43f46f15e342002ffe1dad7aff2ca8c885 SHA-256: 168e322b5e2a78dd88393c5302493bfcf49223eeb29b547581877bf7f5c87671
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary links, disguised as 'boolean algebra lecture notes pdf', redirects to malicious infrastructure at 'ttraff.ru'. This indicates a social engineering attempt to drive traffic to a malicious site, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=boolean+algebra+lecture+notes+pdf
    • http://files.paulsullivanleather.co.uk/uploads/1/3/0/9/130969820/mexagoruxulo_mepitazavijeluk_wulafikobaxij_wibupako.pdf
    • http://gizeda.csobecancour-en.com/uploads/1/3/1/4/131482962/8770124.pdf
    • http://files.brooksidevt.net/uploads/1/3/0/7/130775732/01f633e468e3.pdf
    • http://files.lowersavannahriveralliance.org/uploads/1/3/1/4/131407178/3fba4c940e7196e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5238/3904/files/32608676306.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4254/files/15556293664.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/loxodukelagunavizob.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/mahatransco_syllabus_for_assistant_engineer_electrical.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/13667856365.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/tidejivomimarakamok.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/dekaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72274594547.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/23881051949.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/detumefozupigulizasujaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4143/files/79536397274.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/xuweniva.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/mufeluzunagodise.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_off00005fda.bin
b558a3acea811c85f5c44f1d10f91ed10ec95a63343bb2bd62a1c53401966b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDA 5512 bytes
font_01_sfnt_off000072a2.bin
0784000b6f77d36c04279aa56da4fbcc38e0531553efa57e799b657e61c2b5d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A2 9872 bytes

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