Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1aa409114668c2…

MALICIOUS

PDF

45.7 KB Created: 2020-08-25 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 229807703d151c27b1d276052ff99487 SHA-1: 4efa6ed6bbaf6f10c4e59fa8b6a224de25499cfe SHA-256: fd1aa409114668c2e45ff9305cc6cb20b299836ef7c32c99b5927df38c9cf194
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=android+blynk+alternative'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious URL and several Shopify URLs, suggesting an attempt to disguise malicious links within a seemingly benign document structure.

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.com/pify?keyword=android+blynk+alternative
    • http://wuregibu.fineartfitout.co.nz/uploads/1/3/1/6/131606968/3921315.pdf
    • http://files.doubletalkspeechtherapy.com/uploads/1/3/1/4/131453251/b338a4b1413dd64.pdf
    • http://files.bowtosternfishingtours.com/uploads/1/3/0/8/130814788/rajikitibubese_votonabofafite_dajozelubabut.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/nilapakixipiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/ganoderma_lucidum_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8553/files/alpha_helix_vs_beta_sheet_amino_acids.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/73527339511.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/epistaxis_orl.pdf
    • https://cdn.shopify.com/s/files/1/0428/4320/9895/files/aluminium_sheet_thickness_chart_mm.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4535/files/digraph_phonics_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9160/files/geometry_proofs_quiz_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/16365728097.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1923/files/cover_letter_for_career_change_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006931.bin
2b0601bb798659ff3551a54b56253911d2684d783980309d2a4fbe316cc966d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6931 4784 bytes
font_01_sfnt_off0000797e.bin
f1e259c529d46d5645466a78d86374da2eb126b314dd0b4a32e15a25dc79fa60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x797E 10048 bytes
font_02_sfnt_off00009bef.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEF 4324 bytes

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