Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d8acf2777a99fb…

MALICIOUS

PDF

62.1 KB Created: 2020-08-01 13:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4c87a37e791de391a08b896c6ba2c52 SHA-1: 3043b3a82e3adadd59f0acad10b0ca28dd0f9776 SHA-256: 13d8acf2777a99fb0aba53f96e37bd9f25285b555ac72db1df540336ec3a98d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a redirector to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

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=40.+717514%252C+73.+998139
    • http://files.montanabirdhunts.com/uploads/1/3/1/6/131607712/fanibuneladi-rijezapanututaz-demijejosemal-rumiporulaluk.pdf
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://files.blueacesbakeshoppe.com/uploads/1/3/2/6/132696263/1387438.pdf
    • http://files.tcfrochester.org/uploads/1/3/0/8/130873937/921e0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1456/9631/files/54486856098.pdf
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/48007624783.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/14146529011.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/gajezipebevemanijavu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5578/files/23953146656.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/acronis_bootable_media.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/mabepin.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/32245261793.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/what_is_the_largest_discord_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/9921/0407/files/tamadufa.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/jawajawubetuvaro.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_off0000a7ee.bin
5be2c317745643031fea7689c9d6536728f6689dadf8cd706ce8b6bca8c61bce
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EE 5156 bytes
font_01_sfnt_off0000b9b7.bin
de058f331f3d6d6f913be7f156bb4d2ed56ef3f0a245e239a427f180554f164a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 16324 bytes