Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d90a970c77a8552…

MALICIOUS

PDF

48.0 KB Created: 2020-11-07 06:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ed4816a2a14d8b1fdd41a646cf8ec495 SHA-1: 1c8f54df49bfca5a0b0b65924775cb3543392e9f SHA-256: 8d90a970c77a855239112d2aa26e1ad85b9f9c5e5bf121dd6ba40e3d0a7f8fe3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO manipulation tactic. The primary external URL, https://trafffe.ru/aws?keyword=stihl+trimmer+repair+manuals+free, is likely part of a campaign to drive traffic to potentially malicious or phishing sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=stihl+trimmer+repair+manuals+free PDF link annotation
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/roxejesuzenenowed.pdfIn PDF document text
    • https://mupawume.weebly.com/uploads/1/3/4/3/134365579/6090736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jejagake.files.wordpress.com/2020/11/77880376258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1730cc3d-c87d-478c-96a5-10241b3a2508/parasite_eve_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d9d311-acbf-41fa-a153-feeb10ce4d4b/wejowif.pdfIn PDF document text
    • https://juvibix.files.wordpress.com/2020/11/gabizagamumarokidatanum.pdfIn PDF document text
    • https://sukifozupi.files.wordpress.com/2020/11/voruzosov.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/liziwepaguzigefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea5f5e5-ddf8-4d6c-b323-967ae58d55ad/duguremonawuminewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0a70ac-84af-49fd-8b8f-37f52e9c64f5/nibadosu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59AD 11404 bytes
SHA-256: d514ecc8c2f6893f4929677624b93eb98fa78f4cd5a3be596653e5192c180322
font_01_sfnt_off00007dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDE 5244 bytes
SHA-256: 0cce0b70ae250f580bbbe7ce04a836f3d480bfa9acef0b9ba18b7256a6bdfd47
font_02_sfnt_off00008f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F83 10324 bytes
SHA-256: b74d0e03c8b2e466ccd943a124bb85dfdb4f4601543c1911504edfd54b70024d