Malicious PDF — malware analysis report

Static analysis result for SHA-256 011e6bac6afc6884…

MALICIOUS

PDF

40.8 KB Created: 2020-08-24 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a24b660c0fda3fdaa8628a9077f88c SHA-1: facc2669d9f14108d5d25e77e1a7d8ebe1d2082a SHA-256: 011e6bac6afc6884de3be245e5e8165336542edc8e5f9a197538becd7e9a69fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a deceptive link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the target URL and references to other benign-looking PDF files, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=english+grammar+for+class+2+pdf
    • http://furidaw.cambridgegirlschoir.com/uploads/1/3/0/7/130739919/f304b2b.pdf
    • http://files.ucporegon.org/uploads/1/3/2/6/132682627/waxazutonakezanep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9244/3303/files/facebook_ads_blueprint.pdf
    • https://cdn.shopify.com/s/files/1/0439/3215/6059/files/83126035612.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/wesagijix.pdf
    • https://cdn.shopify.com/s/files/1/0459/9214/9154/files/73252649341.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/79144166654.pdf
    • https://cdn.shopify.com/s/files/1/0434/2857/7447/files/blankets_craig_thompson_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/bandos_guide_2007.pdf
    • https://cdn.shopify.com/s/files/1/0430/9218/1153/files/67041511218.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/apttrix_e_classes.pdf
    • https://cdn.shopify.com/s/files/1/0447/5663/1701/files/fagor_oven_user_guide.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b0.bin
23ac5d4091598347979da47e06537ff558f274d4a60ff017c0f0f65661d3969c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 5660 bytes
font_01_sfnt_off000073c1.bin
1a140b64d4b23c7f4b46eedc42d9c4a246de99f3dfe860192818018cfe0efccc
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C1 10088 bytes