Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3b54ce256d15ed…

MALICIOUS

PDF

40.2 KB Created: 2020-08-24 09:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 929d96e2dfce81915bad8f35876c9c17 SHA-1: 8aeab8c578184aecdf4c37a93f955701f82fb46b SHA-256: 5f3b54ce256d15edcf50171165033f269ec126725db0b8c9f40567f5c5093ed3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to piano sheet music and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm and a malicious redirector indicates a campaign to drive traffic to potentially harmful content.

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.cc/pify?keyword=freely+freely+piano+sheet+music
    • http://files.thecinnamonowl.com/uploads/1/3/2/7/132740498/bobaso-bidet-jemilot-valulusufeto.pdf
    • http://files.centrocha.org/uploads/1/3/0/8/130873870/7918256.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/sheet_metal_folding_machines_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/hexadecimal_to_decimal_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6492/6111/files/best_reader_for_windows_10_tablet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/fivop.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/paxowupazeviwona.pdf
    • https://cdn.shopify.com/s/files/1/0431/8484/9045/files/problem_statement_templates.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8362/files/mirud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/ssc_marksheet_2019_dhaka_board.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/pabusabipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/55945390198.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8613/files/harley_evo_engine.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000451d.bin
4f70115c40780d0777354998859d1086e9be90a323c4c458a3a0662a10a0e004
pdf-font-stream PDF embedded font (sfnt) at offset 0x451D 5192 bytes
font_01_sfnt_off0000569f.bin
7a5683fbb199e8fec35ec4cfea84f22c81ee97867f74261ad795968172bd7a26
pdf-font-stream PDF embedded font (sfnt) at offset 0x569F 14364 bytes
font_02_sfnt_off000083f5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x83F5 4324 bytes