Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1bf36a84872811…

MALICIOUS

PDF

85.8 KB Created: 2020-10-02 05:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c09e7075e58c0c78c50fc81743816d9a SHA-1: 5dc043477f29574676e513a23599dcceaa463f15 SHA-256: cd1bf36a8487281196b1a3b4df7c57787a3da3b4d1a56ddc00632b560de38f36
154 Risk Score

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 directing users to 'gettraff.ru'. This URL is presented as a free download, indicating a likely lure for SEO spam or phishing. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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://gettraff.ru/strik?keyword=the+complete+japanese+joinery+free+download In PDF document text
    • http://tawow.andreafrankhamhughes.co.uk/uploads/1/3/1/8/131856725/5a933906.pdfIn PDF document text
    • http://files.giaddiecreations.com/uploads/1/3/2/6/132695701/tajipibu.pdfIn PDF document text
    • http://files.foragersharvest.com/uploads/1/3/0/8/130814161/313356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bb3efc-04ec-4234-814a-06133f602eb1/39793397951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464bfa8e-34c7-465f-8d6b-5df555a897fd/81991778435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5293dc-9435-4b33-ab25-5378106202f8/80345721368.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6514/3207/files/vusuwuxoxonepupir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/37157388852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/zmodo_h264_manual_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0796/2018/files/1758923423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0562/6536/files/64822132736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347e8a3d-77e2-4602-8653-db4a88a94747/90329662111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69aa5880-5f17-421b-ba64-1d9c949254c8/pajizejexufu.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_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 5612 bytes
SHA-256: 16172f5220ef852695b4fc9c3efb7f8841e94ca3a24f6e8cbd404eb7cdedaf67
font_01_sfnt_off00012685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 10356 bytes
SHA-256: 2c3db8f50f3806edc387081aaec05d1b1c14aa3a964cfed6f14df8d5cfb0fc35

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