Malicious PDF — malware analysis report

Static analysis result for SHA-256 53397c2d474c2e8d…

MALICIOUS

PDF

50.9 KB Created: 2020-10-03 19:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d88c4f2e58f9426f23d4d81347aead44 SHA-1: 3ef11e945bf85b39b64f617834ecff1d3712e802 SHA-256: 53397c2d474c2e8dccca4eb62c0f176b18076711de1907cfdad259346ecc49c3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://cctraff.ru/strik. Additionally, it exhibits characteristics of a PDF link farm, with numerous links pointing to external PDF files, many of which are likely malicious. The document body, though partially garbled, contains the same malicious URL, reinforcing the intent to redirect the user. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to lead the user to harmful content.

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://cctraff.ru/strik?keyword=device+cdrom0+has+a+bad+block In PDF document text
    • http://files.langdonrecreationcentre.com/uploads/1/3/0/9/130969580/zebitupata.pdfIn PDF document text
    • http://files.kingfisherwellbeing.com/uploads/1/3/1/6/131636872/vofel.pdfIn PDF document text
    • http://vagiweto.movablesconsignment.com/uploads/1/3/1/0/131070420/2384250.pdfIn PDF document text
    • http://lisexilas.australianwildlife.co/uploads/1/3/1/3/131397997/ea8e27651e08572.pdfIn PDF document text
    • http://files.morroandjasp.com/uploads/1/3/0/9/130969375/wojerodijudo.pdfIn PDF document text
    • http://xufazemef.org-engineering.com/uploads/1/3/1/6/131606228/113245.pdfIn PDF document text
    • http://libapena.lastwatchhorology.com/uploads/1/3/0/7/130776208/vaxetujizip_lejijum_meponixe.pdfIn PDF document text
    • http://files.moonwalksdetroit.com/uploads/1/3/1/8/131857598/468c41.pdfIn PDF document text
    • http://sexuj.forever-enlightened.com/uploads/1/3/0/7/130739732/8264341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8178/8320/files/17042977748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/wuzuviw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0475/4623/7094/files/construction_office_manager.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5313/3218/files/wojilogitizonufuwizora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B05 5188 bytes
SHA-256: adcf2a583711f032da0673336be19c73b8429ed332e1670cef668169f6bd1f0e
font_01_sfnt_off00008c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C99 10472 bytes
SHA-256: 6bb252e1e1149569fb5aeaad83961eb5ee87eb536dac41c27ad3a37f329bb904
font_02_sfnt_off0000b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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