Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0d43678b4a906f…

MALICIOUS

PDF

113.6 KB Created: 2020-11-23 09:06:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7dc240daf63d13fe86791b194cf0015f SHA-1: 24405a8f0f7d3963879993d3df8a9af5a84836db SHA-256: 3c0d43678b4a906fe4b58afa9df09db25b10d385b1454828db92da7f76488134
170 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed lure and an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gettraff.ru/aws?utm_term=celestial+white+noise+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_5f9a21b7653f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_5fb28fa29f4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_5fa9e8bd2be9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_5fb8834db3776.pdfIn PDF document text
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/vopemijifujebagude.pdfIn PDF document text
    • https://razivixa.weebly.com/uploads/1/3/4/4/134498077/6825417.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/f25f71.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/tadovu/jadomiriletesovixetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2188ae9f-963d-4830-98cb-9706dcb78af6/kugaledelukodudowuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b569644-868f-48c8-b61b-12ad09d06740/12199601352.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/17549952218.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/packaged_drinking_water_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/65315803518.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/kinh_dia_tang_vuong_bo_tat_thich_tri_hoa_tung.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16844 4852 bytes
SHA-256: c93ba1ae17ad93b160b86cc4a83a9c47390ec14f1493a82e2de56fe0b4b5d408
font_01_sfnt_off000178cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CC 11780 bytes
SHA-256: f1cda4bac74b087eb51c7f2ffda6b72865d74f50b404336b5b7097f1fd37d991
font_02_sfnt_off0001a12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A12E 16664 bytes
SHA-256: 41acda88bb7f3a8854d1ac83bd5338fc9b920bf65d098a39924fee5a8b2c51c4

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