Malicious PDF — malware analysis report

Static analysis result for SHA-256 5feb2aeaac52d0aa…

MALICIOUS

PDF

44.4 KB Created: 2020-11-03 02:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e73bc9007e20eb74b88c3f469aca34c0 SHA-1: 747e4186fa0efdf679ef5637da3fb6079ff947f9 SHA-256: 5feb2aeaac52d0aa1bc386e702883ac3aaefbe6373858d97aa89ad535b701b3e
162 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'new partition error' and embeds a link to a known malicious redirector. The document body also contains numerous links to external PDFs, suggesting a link farm or SEO poisoning attempt. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely to redirect users to malicious infrastructure.

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://ttraff.ru/123?keyword=we+couldn+t+create+a+new+partition+error In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2069/5742/files/bimirovuwoxemevofudixipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2412/9437/files/fedders_5000_btu_air_conditioner_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/new_additional_mathematics.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/dunhill_homes_frisco_hills.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/how_to_craft_a_fishing_rod.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/41629096919.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/nerulusi.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/atletismo_saltos.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/causes_of_carpal_tunnel_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/madazimolezowef.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/vofiwemavuzejapej.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/buwobetu.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/80507190337.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/dried_cranberry_cookie_recipes_easy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7219/0132/files/xisoma.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/95774686661.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_off00006f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F71 4992 bytes
SHA-256: 4bae039324a27196472c921c8ed668c6d84bfdc6c76586d3e83c5fef6cfcde5a
font_01_sfnt_off00008093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8093 11032 bytes
SHA-256: d1d49e8203e2cd6aa16040104035ab77eb5ea3ae969056ab81d7ca053fedd86b

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