Malicious PDF — malware analysis report

Static analysis result for SHA-256 0505036c3de93f79…

MALICIOUS

PDF

39.5 KB Created: 2020-08-18 21:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c94e89c6ed5c5967dc3d2bee577ba5c SHA-1: a3caa760d18da0b8a276d31824cfc672076f8222 SHA-256: 0505036c3de93f795f675a2ee6bce098a1f9d450ee15d3c3428c7529bd187d19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=arcade+fire+crown+of+love
    • http://gamodokuf.glogconsult.com/uploads/1/3/1/4/131453133/3102648.pdf
    • http://files.ibstudyskills.com/uploads/1/3/2/6/132696263/vopajuwe.pdf
    • http://files.colourpurpletherapies.com/uploads/1/3/0/7/130776065/juvofewulutimupisopa.pdf
    • http://files.rhymedilation.com/uploads/1/3/0/7/130776786/c138d437c91322.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/jeteze.pdf
    • https://cdn.shopify.com/s/files/1/0431/7184/0161/files/algorithm_book_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/41549657241.pdf
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/mosupu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/rugujupukabu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/27962480043.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/zibagixapesujawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/94185248878.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/zolupoxijewunu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/donoxeliludokebatetutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/matebook_x_pro_egpu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3784/files/frequency_adverbs_exercises_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/kajujorameze.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_off00005e74.bin
f5f7597f214b338b4ad2fbaa2da0f78f875cf21e8de6d315135787f65aa82a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E74 4980 bytes
font_01_sfnt_off00006f7c.bin
0753f717e75c53942be90c169b89dc0837322a8905380c1108b077c593858d11
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7C 9788 bytes