Malicious PDF — malware analysis report

Static analysis result for SHA-256 607eddef7eaabe57…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 11:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dc4b0342cb6c8a2f302f18605fab008 SHA-1: 1df9f60031331a2ecfae27a86dba90840da3de98 SHA-256: 607eddef7eaabe573d37450f7e74d28eca62ccd1d72bb07d1eca5b6e10b1d164
154 Risk Score

Malware Insights

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

The PDF contains a deceptive title and embeds multiple links, including one to a known malicious redirector. The primary malicious link is disguised as educational content, aiming to trick users into clicking it. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.cc/pify?keyword=meiosis+worksheet+answers+extension+questions
    • http://tafov.ruthmorganjones.co.uk/uploads/1/3/0/8/130813364/nipes-toxogubemumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/17357919361.pdf
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/hernia_epigastrica_cirugia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/71516001295.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/apache_netbeans_11._1_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/kafuxemojumegudulojevik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/tomulak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wajumibuxup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6375/files/49973582515.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/zekolevetanuvokokajizafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/71169935638.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/duruludobu.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_off000066f7.bin
4401a9d0f43e4ed12e9046dfc2e44568be432b2f40e2382d764f8a4d5e19812e
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F7 5096 bytes
font_01_sfnt_off00007863.bin
f90083baca4bad10b171bb9804ae3f61721320bfda7df83bb6c5d691fa144d82
pdf-font-stream PDF embedded font (sfnt) at offset 0x7863 9956 bytes