Malicious PDF — malware analysis report

Static analysis result for SHA-256 6105f7d4619214c5…

MALICIOUS

PDF

48.9 KB Created: 2020-08-09 01:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b59f3e44ce11c2564a188829ce677c SHA-1: 3467f1a29dbfd319811d2d5ab43595c5ec5675f0 SHA-256: 6105f7d4619214c54001c85c723a6fd0b693dca7ea33d51bc567605c37fbd6ba
154 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to a link farm designed to generate SEO traffic. One prominent link directs users to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=basic+russian+conversation+pdf`. The ML classifier strongly indicated maliciousness, and the presence of multiple external links suggests a phishing or traffic-generation scheme.

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=basic+russian+conversation+pdf
    • http://files.academyonegoalkeeping.com/uploads/1/3/1/3/131381722/5881792.pdf
    • http://files.bestdogintheuniverse.com/uploads/1/3/1/1/131164462/topib_tokaw_zopel_xakenebubavimep.pdf
    • http://files.gracebubeck.com/uploads/1/3/0/7/130740586/6617594.pdf
    • http://files.cathymacraeauthor.com/uploads/1/3/0/7/130740097/juledoma.pdf
    • http://files.freshrescue.com/uploads/1/3/1/3/131398357/2325814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/tutinapomikakasojakava.pdf
    • https://cdn.shopify.com/s/files/1/0437/3259/8938/files/breakthrough_plus_level_1_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/resaneseloniti.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/git_drop_changes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/zajarituwexexomenoza.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/82538932911.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/51899343813.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/59412348763.pdf
    • https://cdn.shopify.com/s/files/1/0431/2062/3765/files/bahishti_zewar_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9270/files/xitisex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.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_off0000801f.bin
7cba778d580c5b9da48a8ae08d00e08849ca1c0590a36b89bc0b6159de2c78ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801F 5228 bytes
font_01_sfnt_off00009203.bin
d71409f7bc05b2e857ce1a1defe84b3f232e179adaed9bf839cc9db9b6f551a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9203 10688 bytes

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