Malicious PDF — malware analysis report

Static analysis result for SHA-256 320473147d822067…

MALICIOUS

PDF

54.9 KB Created: 2020-08-13 23:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7a624aedcdbe4036ead21b7373b10b5 SHA-1: 6fc759683d9259acef1a0d5252566291f4cd6be4 SHA-256: 320473147d8220675f132cd0ca7639fb58b9032c3956bf5ab15670a4d567e04c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The presence of numerous Shopify-hosted PDF links suggests an attempt to create a large, distributed content farm for SEO poisoning or to host malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm attack pattern.

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/pify?keyword=khatu+shyam+bhajan+mp4+free
    • http://wutisa.legacycakery.com/uploads/1/3/1/0/131070722/juseb-kuwere.pdf
    • http://rowobeze.ptspreschool.org/uploads/1/3/0/8/130873826/zalimodaro-pemanajofiziduj.pdf
    • http://files.ballroomforfun.ca/uploads/1/3/2/7/132712129/losibajipesepo_toxino.pdf
    • http://puvuxewof.strongandskinnyfitness.com/uploads/1/3/2/6/132683024/4667860.pdf
    • http://lerowan.professordos.net/uploads/1/3/2/6/132695375/moguwasozobirutaka.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3189/files/71502895918.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdf
    • https://cdn.shopify.com/s/files/1/0440/1404/3294/files/bless_the_lord_o_my_soul_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/padirijodisewedapoje.pdf
    • https://cdn.shopify.com/s/files/1/0440/8072/6168/files/proyecto_de_grado_arquitectura.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/occupational_lung_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/62653960712.pdf
    • https://cdn.shopify.com/s/files/1/0431/3969/4741/files/breeds_of_goats.pdf
    • https://cdn.shopify.com/s/files/1/0439/0558/1211/files/kugana.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/futagizivufoja.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/fiwipi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/wevikanisaxiwetabepugixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/system_approach_to_problem_solving.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b93.bin
0ec764a59ff25b84c83a45d0ed11766e7f0587c69a920f1e73817532b6e5a74f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 5484 bytes
font_01_sfnt_off00009e30.bin
798f8de554f48ab21700d0daa56aabadf7fa990cc051e0ffdbf2d1e933722eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E30 15604 bytes

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