Malicious PDF — malware analysis report

Static analysis result for SHA-256 0813b36a79097b28…

MALICIOUS

PDF

38.2 KB Created: 2020-10-05 06:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3cd958e032b32811e266458d96f4df39 SHA-1: acdf97dd00616c5e6b3358d728265a66514b353d SHA-256: 0813b36a79097b28f3eed87dcece33056829d557aa7dedee45dee07b82e5e36d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gettraff.ru/strik?keyword=my+time+at+portia+animal+fat In PDF document text
    • http://xatas.gitaarlesdamwoude.nl/uploads/1/3/1/6/131606490/a611d04b.pdfIn PDF document text
    • http://files.randallsimonpiano.com/uploads/1/3/1/8/131856907/zedawajijuvanukuxawa.pdfIn PDF document text
    • http://febodu.theflyingbanners.com/uploads/1/3/0/7/130739777/tolefiget.pdfIn PDF document text
    • http://birisemej.babydreamsmc.com/uploads/1/3/2/3/132302978/welanakuw.pdfIn PDF document text
    • http://sokojurit.asburycropfarm.org/uploads/1/3/1/8/131856713/zagobedizutekut-vadewasatetevit.pdfIn PDF document text
    • http://geduzujaj.citizensforcivicrenewal.org/uploads/1/3/0/7/130740199/saxejusosowinoluva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2340e48e-9815-4eae-a086-f8a6cce77add/534707670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d9adc9-f066-4ae2-bd7d-12ba9f856892/2246758223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11295082-9921-4b0a-bfe8-d1f48ca8b2e6/zemubatitazunez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1144/0291/files/nina_and_pinta_schedule_2016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/92359546561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5317/8791/files/mevubolena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/the_mine_song_but.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000625b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 4976 bytes
SHA-256: b57d2709950bcd02f4fa9cc13323870658fa48ee01a488f654b6c1cb02b9ff24
font_01_sfnt_off00007345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7345 10140 bytes
SHA-256: ab3204633342c812fa3debc49a451229503fd936659ec1d8febe4b279617b379

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