Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2a72b9865c3f1f…

MALICIOUS

PDF

62.8 KB Created: 2020-08-05 03:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35e14505aab783a613bb515c0c6cf93e SHA-1: ca6c2bf758b2a5a76f3d7f1e63cb7ee903a7444c SHA-256: 2f2a72b9865c3f1f7cdc83f174867f0e9d8302d0ac47b4c4502dddb8b3ab0b50
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, with one specifically pointing to a known malicious redirector. This suggests the primary attack pattern is to lure users into clicking these links, leading to potentially harmful destinations.

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=definition+of+human+development+in+psychology+pdf
    • http://files.woodsmuir.com/uploads/1/3/1/8/131856186/26ca25d6e3c266.pdf
    • http://files.singaporepoetryslam.com/uploads/1/3/1/4/131455463/8bdb9f5e.pdf
    • http://files.connectedrealities.com/uploads/1/3/1/3/131379532/d55f417054788fb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/60667817106.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/kafanele.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/relakiken.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/85351329236.pdf
    • https://cdn.shopify.com/s/files/1/0428/9311/5558/files/jojuboxudipoderivijodan.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/6877055109.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/xefitisanujat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/sunojupilelirajada.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/zamatuzeva.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/91659302952.pdf
    • https://cdn.shopify.com/s/files/1/0434/3798/1852/files/solving_quadratic_equations_by_factoring_examples_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/avery_file_folder_labels_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/57191990017.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/tusubaferimuj.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_off0000b6da.bin
1c1be01185b50f1c3b04bedf756f5eb6741a4337a58a9a3e513d2f42fb5fde13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 5636 bytes
font_01_sfnt_off0000c9fa.bin
030bddcc84c21e526ea7d64f1f7f13880f258c02cca869c3f105f7bb3d438597		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 10420 bytes

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