Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc7f0d3d5cceaac…

MALICIOUS

PDF

50.8 KB Created: 2020-08-19 00:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6d081d7a29b7ae479671d64ccb6db99 SHA-1: 4d51abe438fea51e88045b493809b405bb292d6b SHA-256: 0cc7f0d3d5cceaacea12213b043ded9d0e88c8263dc3f777ebd92f1b6df431d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external content. The presence of numerous links points towards a link farm or SEO poisoning attack.

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.com/pify?keyword=archero+guide+weapon
    • http://files.naturallyminded.co.uk/uploads/1/3/1/8/131856146/41f874c2ef33018.pdf
    • http://wagobiri.in2ithealth.info/uploads/1/3/0/7/130740592/kudaxaradogo-wovinokoloxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9516/9950/files/mekanisme_parestesia.pdf
    • https://cdn.shopify.com/s/files/1/0438/5678/9664/files/95205214997.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/nalanigebivanoxuzeto.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1039/files/affective_continuance_and_normative_commitment_to_the_organization.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2633/files/limiting_reactants_chem_worksheet_12-_3_answer.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/theorie_des_besoins_de_maslow.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6842/files/jimolezagewebutunukux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rafudegilezenetizaxesuvos.pdf
    • https://cdn.shopify.com/s/files/1/0439/6879/0686/files/sufotuladej.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/zojipovedale.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7434/files/vunogigipal.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/wonuperatonadilinevukuj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007796.bin
810597596710ff95bbf985dbb12eb887088db217d355364d36749e77c1bc64c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7796 5008 bytes
font_01_sfnt_off00008898.bin
5e88273a44d3d41cec2f3247a9436516ff70bbfab9bb5ce8663e75151c679054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8898 12432 bytes
font_02_sfnt_off0000b06c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 4324 bytes

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