Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e3e26214cfa757…

MALICIOUS

PDF

43.0 KB Created: 2020-08-09 05:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d2168798a75989018a812ba35ed0c9a SHA-1: 3c9bb456c911c875566b6823d3985380ca97c3c8 SHA-256: 67e3e26214cfa7576332b846cf4b96b0a8995b26097aa1d66dc66247726cec6e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL that redirects to malicious infrastructure, disguised as interview questions. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to lead the user to a compromised site. No scripts were extracted, but the PDF structure itself is used for 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.ru/pify?keyword=analytical+research+and+development+interview+questions+pdf
    • http://files.leegroszracing.com/uploads/1/3/0/7/130776069/vagirem_firem.pdf
    • http://files.sailingcruisingscotland.com/uploads/1/3/2/7/132712315/jataz_pikelaru.pdf
    • http://files.thestringbean.com/uploads/1/3/1/4/131437982/ledigukemenezol.pdf
    • http://files.faloonaagency.com/uploads/1/3/1/4/131437283/nikiwubobelo-mosunonelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7748/2136/files/3d_printed_gun_file.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/someone_anyone_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/1110/3128/files/mafia_2_free_roam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/77602515902.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/prairie_bonnet_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/vutumuzesifuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/babifavubukofibim.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/46692158964.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/nejajiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/64453812352.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_off000067e7.bin
b167f796b465d3e74e75da29c173ba72d778aceb673b054dcb7a7d1395c091c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E7 5764 bytes
font_01_sfnt_off00007b7a.bin
1a705f4dc650e01a045cd47787550df2d354ff1a67dcda8f85e5673d2177c013
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7A 10288 bytes