Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ceae1d5e24764f1…

MALICIOUS

PDF

39.3 KB Created: 2020-08-01 22:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4874f37266148d02540dfe65e973270 SHA-1: 6719249ba7647fd06c422374c69dda812d94e3b0 SHA-256: 6ceae1d5e24764f15c28768e51195018ab56fa5f50c322233aa316d46cf7ed2c
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 a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, disguised as a UCSF referral form. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content widely.

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=ucsf+referral+form
    • http://files.cultivatemusicstudio.com/uploads/1/3/2/6/132696128/6a231377.pdf
    • http://files.pktcstudioservices.com/uploads/1/3/1/6/131637606/ketugosewisudus.pdf
    • http://files.northernplainsheritage.org/uploads/1/3/1/4/131453268/3622259.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/japoxufinidaxejijibija.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/vesetejafenirubam.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/95961515045.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/1055221178.pdf
    • https://cdn.shopify.com/s/files/1/0440/4684/4054/files/91976571216.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/kefodegunukubajotoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/15669819566.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/18398721093.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/84639161098.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/49310393163.pdf
    • https://cdn.shopify.com/s/files/1/0438/0403/3181/files/newadugipabotedaga.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/23415630348.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/dodofitabuwipigigisop.pdf
    • https://cdn.shopify.com/s/files/1/0427/4411/9462/files/xoxafosafu.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_off00005d51.bin
41246cd3e0c07ec94d63da3bd0eb85c36a8b37a901b74c1fe1736a257b5db294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D51 5016 bytes
font_01_sfnt_off00006e53.bin
4b06841f762b0474f6ae0faa8109703907027782856fa72eab4a8e5642606956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E53 10040 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.