Malicious PDF — malware analysis report

Static analysis result for SHA-256 499790a381229ec3…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 17:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 160a2eee9a394bc44e83c80dc23baf39 SHA-1: 003ddb7cc3af9e753f69a42b9188e7cbe4489adf SHA-256: 499790a381229ec3c1aed530e974e91922ae3725167475b5dbda60a00844a334
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains references to medical terms and URLs, suggesting a lure to trick users into visiting malicious sites. The presence of a malicious redirector link indicates an attempt to deliver a second-stage payload or phish for information.

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=myocardial+infarction+ecg+pdf
    • http://files.jucheyproductions.com/uploads/1/3/1/6/131606677/jepep-panopazow-jixufimitoraluj-kukajakod.pdf
    • http://files.photographybyphilodell.com/uploads/1/3/1/6/131606284/1688860.pdf
    • http://files.nickiburnett.co.uk/uploads/1/3/0/7/130776795/nuwisud-galimev-gavorifuzawir.pdf
    • http://tedov.volunteerfirefightersassociationoklahoma.org/uploads/1/3/2/3/132303382/add21573d2357b.pdf
    • http://files.thruhannahseyes.com/uploads/1/3/1/4/131453124/6153976.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/3124647509.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/juwusabovisurowevateneg.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/kemapozogosimijuzoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/73822935150.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1105/files/kazine.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/86620056508.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/nikon_d70_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/74193186601.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4422/files/lazosodiguladup.pdf
    • https://cdn.shopify.com/s/files/1/0438/3480/2333/files/tujobuganagumize.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/lalatulobazalixofopun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/wurorujab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/petirekevejizopulunuziru.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_off0000678d.bin
19f0b7e7d9c90441b5a26ce30671fb8d0ae77350ef9765191d0dab259f50f2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 5252 bytes
font_01_sfnt_off00007986.bin
8ccdf49c25ed7febbd8d4b748c8b611386d7a012ea206817244dca863066dbc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7986 10228 bytes

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