Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d92f883dd1fea14…

MALICIOUS

PDF

56.6 KB Created: 2020-08-19 06:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3540aab998fb2b0033761cff45309144 SHA-1: b45f81df7a37f2b66389eca7563c05e635e02f0d SHA-256: 5d92f883dd1fea14c86b8c123401a57ae450ca3159c16c88f1e2a1a351e2f5f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body contains text that appears to be metadata or obfuscated content, but the primary malicious activity is the link farm, suggesting a lure for phishing or SEO spam.

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=fotoreportage+humberto+tan
    • http://kezinarep.anajazphotography.com/uploads/1/3/0/7/130739732/durusuriwalavu.pdf
    • http://files.flowartspace.com/uploads/1/3/1/6/131606630/tizufenazaj_miloda_kamurovisoriwu.pdf
    • http://bunap.bbflockling.com/uploads/1/3/0/7/130775169/2621384.pdf
    • http://fapox.cocoatreecarbondale.com/uploads/1/3/2/6/132682883/pagatujavuju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/criminal_law_amendment_act_2020_bare_act.pdf
    • https://cdn.shopify.com/s/files/1/0438/6701/3280/files/text_formatting_discord.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/rirukezosekabigukefub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7669/7760/files/iata_city_code_list.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/kolufenizota.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/19181140131.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/mowaxekagiwofi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/64371901563.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4940/files/aap_guidelines_for_diabetes_screening.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/bullet_points_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/47948794002.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_off000096fb.bin
3c7dd6fb7e7483e758ffab6e43a78c544cac49425a591813261484937b472a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x96FB 5116 bytes
font_01_sfnt_off0000a840.bin
f15a86d2bd5a58f4dbce0dbec7340e671799fbf9dfa43ac2ea996fb4e0ed9d53
pdf-font-stream PDF embedded font (sfnt) at offset 0xA840 14668 bytes