Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb76c8aed9561f4…

MALICIOUS

PDF

46.0 KB Created: 2020-08-12 01:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 057a67afe05e333effa7746f361c03ab SHA-1: c26c76c9d9b9511d599694695405eefdbbcb6b63 SHA-256: dcb76c8aed9561f4ed188568ab9940d5e580bf2a52d2e5512fc7a8ee38a362d5
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it contains a redirector link to known malicious infrastructure. Additionally, it features a large number of embedded links, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves leveraging embedded URLs for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=slang+english+words+pdf
    • http://lenow.christianlifeupc.com/uploads/1/3/1/4/131454012/kelurafazo_ruloduku.pdf
    • http://pipuza.soniagfh.co.uk/uploads/1/3/1/4/131406686/gudukojalo.pdf
    • http://files.mayfieldwoodsorchestra.com/uploads/1/3/1/3/131379894/maroninejib-vulusuxetu-poxanapim.pdf
    • http://files.hempfilms.com/uploads/1/3/1/4/131483005/3691377.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/aptitude_questions_and_answers_for_interview.pdf
    • https://cdn.shopify.com/s/files/1/0427/4506/9724/files/jiwuvufasamososudux.pdf
    • https://cdn.shopify.com/s/files/1/0435/9585/8088/files/72515504745.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/82511444139.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/4882207447.pdf
    • https://cdn.shopify.com/s/files/1/0433/0107/7142/files/37999927178.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8838/files/43392697199.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4204/files/mirijomu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2959/files/electromechanical_actuators.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/couper_fichier_gratuit_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/1218014714.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/pathway_retinoblastoma_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0429/7247/9647/files/68330219173.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_off000073c5.bin
ef244e1df54f1058071a7440664aa2049f4d6527c4fcb7afdb28ff9dc1181b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 5500 bytes
font_01_sfnt_off0000867c.bin
ad82d49adb5da6ab1e2d1eb5b6718012ee441c70fe35097af477cd8171057a9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x867C 10580 bytes