Malicious PDF — malware analysis report

Static analysis result for SHA-256 b135486b98a27d1b…

MALICIOUS

PDF

38.6 KB Created: 2020-11-01 15:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 673c2c19355be8fbaaf6bdbcb892b0ca SHA-1: 179add6689d9a37ee50b1ab9fbd884ef598b2745 SHA-256: b135486b98a27d1bcbb837ab760616efbfa25e0043f4091eb94b0ac4433433c5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.ru/123?keyword=polaris+repair+manual+free+download', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users into clicking it. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/123?keyword=polaris+repair+manual+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f89f85430abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f97c0f17cae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f99d92da5070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f8e0132f00cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5f93b2afec95a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5f9cd6bb756ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5f99bdd2b15fa.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/lodunixodetum/cosco_booster_seat_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/maytag_washer_manual_test_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fusatesatewaxesagik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/3073/7830/files/83268980706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2419/8050/files/kubernetes_up_and_running_dive_into_the_future_of_infrastructure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4847/1194/files/38608885879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2889/6674/files/fgo_event_farming_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5386/1032/files/62183945129.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_off00005872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5872 5280 bytes
SHA-256: 978fd4418fd5aa1c02e02855aeee7b16de78177681cba55e97577deb5227d680
font_01_sfnt_off00006a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A64 10368 bytes
SHA-256: 371fb134445b14694d93213135c06c407eca8af526ceee5b958f15016dfb1903

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