Malicious PDF — malware analysis report

Static analysis result for SHA-256 f731157cca3f2df8…

MALICIOUS

PDF

123.7 KB Created: 2020-08-06 20:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24af22aba0eb37853ec1a57611b825d3 SHA-1: cb9ff731d58de8eb1a14fa3b3cda6ce5413460e2 SHA-256: f731157cca3f2df842d24aafb889c5fa95300a9feb8b295f580c4f0a8dfcb2ad
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a "black roots science pdf download". The document body also contains this link, reinforcing the lure. The presence of numerous external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier 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.cc/pify?keyword=black+roots+science+pdf+download
    • http://files.obakosobotanica.org/uploads/1/3/1/8/131871994/fc4e88a2a.pdf
    • http://files.ssgabrielandraphael.com/uploads/1/3/0/7/130739120/d4f98cde0f.pdf
    • http://files.gh-ed.com/uploads/1/3/2/3/132303012/277c2880a2.pdf
    • http://files.northernidahorentals.com/uploads/1/3/1/8/131857540/budogubusijora.pdf
    • https://cdn.shopify.com/s/files/1/0444/4828/4839/files/aluminium_curtain_wall_details.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/82968275358.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/simujerarevufolo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/xamaxegapijes.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/ibps_clerk_notification_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/pa_driver_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/78547652605.pdf
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/kudoluvalakidido.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41326774972.pdf
    • https://cdn.shopify.com/s/files/1/0437/1228/2789/files/pakagepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/19100165388.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_off0001a68d.bin
f4aa6794c5610aa32c86d9e2fff6c88d299a8942a29ea29cc246ffc67b15a5e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A68D 5356 bytes
font_01_sfnt_off0001b8e8.bin
3145c5b2722115206e713b9274b94e635bc64d457e38e5698d672289a89d426f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E8 11764 bytes