Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef3efc2288e9b4e…

MALICIOUS

PDF

46.4 KB Created: 2020-11-05 23:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 35eaacd018bac5e354b86ae7959df8e5 SHA-1: bd5f52200aecc5d24ba3753d08b4b8c5061f3690 SHA-256: 3ef3efc2288e9b4e131638e78163cebf138bb38deacc0cc593f22e5a8638532a
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ggtraff.ru/strik?keyword=level+e+vocab+workshop+unit+4+answers'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'https://s3.amazonaws.com/zirojopemup/asvab_paragraph_comprehension.pdf'. The document body, though heavily obfuscated, contains the lure text 'level e vocab workshop unit 4 answers' and the malicious URL, suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/strik?keyword=level+e+vocab+workshop+unit+4+answers In PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/luterefuxa_jexijepove_mugifuk.pdfIn PDF document text
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/9378446.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/2f0e95c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_5f9249cf31c73.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/faxenute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/asvab_paragraph_comprehension.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/2575813172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8050c3-815a-4be2-baa5-4bebd546edde/83090749179.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/alouatta_pigra.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/ww.gta_vice_city_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/a_dozen_a_day_book_1_primary.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7383 5408 bytes
SHA-256: f3b894e34e01be769f71ae57feb2f99b2f9511f6aee20f318380833b25cd6b6a
font_01_sfnt_off000085fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FB 11340 bytes
SHA-256: c73e28f642193a541e94c6e61e38c66797709397d5bc54d4d8d269836ae6ec41

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