Malicious PDF — malware analysis report

Static analysis result for SHA-256 677c8939c96663ec…

MALICIOUS

PDF

44.3 KB Created: 2020-09-30 16:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b7e51ff4b21baba80e759259738bbfeb SHA-1: a1f52e4f32e8b00147c1dbf75726adca6ada0be7 SHA-256: 677c8939c96663ec055276eaeb38aa7181402a5e5002ead77bf9cda0ac53ce44
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://cctraff.ru/strik?keyword=behavioral+learning+theory+pdf In PDF document text
    • http://jetulekiv.kerrieannespicer.com/uploads/1/3/1/0/131069910/9499732.pdfIn PDF document text
    • http://files.powerbusinesscrm.com/uploads/1/3/2/7/132712235/2b41e.pdfIn PDF document text
    • http://danefi.provipcleaning.com/uploads/1/3/0/7/130739377/7069118.pdfIn PDF document text
    • http://xobapub.rustywoods.com/uploads/1/3/1/6/131636725/3229957.pdfIn PDF document text
    • https://site-1038627.mozfiles.com/files/1038627/zelefoforafewal.pdfIn PDF document text
    • https://site-1037028.mozfiles.com/files/1037028/jusolakogunumibexavovi.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/37470211298.pdfIn PDF document text
    • https://site-1037169.mozfiles.com/files/1037169/jitivuresilupugesi.pdfIn PDF document text
    • http://nizalexow.gatesgames.ca/uploads/1/3/0/9/130969059/1444839.pdfIn PDF document text
    • http://mozeras.therpfhandbook.com/uploads/1/3/1/3/131384401/3374250.pdfIn PDF document text
    • http://zowape.arabrams.com/uploads/1/3/0/7/130776167/7a2f9ad.pdfIn PDF document text
    • http://files.jacob-richman.com/uploads/1/3/1/4/131438460/945aa13125bc.pdfIn PDF document text
    • http://toralo.darvanderhoop.com/uploads/1/3/1/0/131070357/7098090.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/ca1e36ef-70a5-4068-9dc1-dbd48e584cdc/tunomopobufalibesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672e175f-cf01-4a28-890f-de41f6dbf8f0/22019578166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1461157-1fd6-4528-8629-652d6feba415/49116139159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf0e805-33fe-4d61-93e4-6b682c1a6203/wiwim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e2824a-b788-4559-804c-afad3155db90/zemapupitukewumawewonu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00006fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCA 5336 bytes
SHA-256: 808e5ab93260ee7a5c933842ca9b4283d1a775c3726f997a34a074a645c3f5fe
font_01_sfnt_off00008200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8200 9992 bytes
SHA-256: b966e621df52eb1f5b5834dc9b03641254e3ecbf63940601357a5e57f106e4bf

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