Malicious PDF — malware analysis report

Static analysis result for SHA-256 664fe4dcf3497a42…

MALICIOUS

PDF

43.3 KB Created: 2020-08-04 09:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ab02ad5291a301cb202bef2d41a9f01 SHA-1: 66ee2e2bce2de48c2b35279e5dc6871aed054cfb SHA-256: 664fe4dcf3497a426775251eddd47436be64829a28a5272b1c2516eb5af19e3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One prominent link, https://ttraff.ru/pify?keyword=allotropes+of+carbon+notes+pdf, is flagged as a malicious redirector. This indicates the document's primary purpose is to lure users to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the extensive link farm and malicious redirector are strong indicators of malicious intent.

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=allotropes+of+carbon+notes+pdf
    • http://files.mcminnvilleaircraftmodelers.com/uploads/1/3/2/7/132712043/mejine_rogozadet.pdf
    • http://files.eaglemountainvolleyball.com/uploads/1/3/0/9/130968956/d7a91012f.pdf
    • http://files.kickskloset876.com/uploads/1/3/0/7/130740183/tebeduxibodiwoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/zisuwumamopobaxez.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/napunajatojazadogimawaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/cch_chuyn_t_sang_file_nh.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43106273748.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/tukamimupoberip.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7423/files/convertir_a_word_editable_ocr_online.pdf
    • https://cdn.shopify.com/s/files/1/0438/0341/0589/files/eu_blue_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/1204/6491/files/completed_staff_work.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/fevaziwoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3989/9304/files/sukilij.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_off00006c00.bin
d6d54ce5641d13a082d1c28430a7997d6e3570c4a30db329ff0d02a07f5db58f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 5276 bytes
font_01_sfnt_off00007dfc.bin
8637d8da3b430827e62a0f1af78aec6144411a83c694c6379a71fbd578f6bb84
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 10152 bytes