Malicious PDF — malware analysis report

Static analysis result for SHA-256 831202918cf081f9…

MALICIOUS

PDF

47.1 KB Created: 2020-08-21 10:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a34369a832b7f4b7ae012422b2d444fd SHA-1: fe187b8a68a760af8f20d85e049b024a74700f4e SHA-256: 831202918cf081f94bf40775a629fee7d9edd8d6e806938e75ed988612786a08
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious redirectors, indicating a link farm or SEO spam campaign. The primary malicious URL identified is ttraff.ru, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be part of a scheme to drive traffic to these sites, likely for further malicious activity.

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.ru/pify?keyword=campylobacter+jejuni+en+alimentos+pdf
    • http://lusafova.jessicamaytaylor.co.uk/uploads/1/3/2/6/132695569/b66890a8f027da.pdf
    • http://nolifuber.nelumplaylist.com/uploads/1/3/2/7/132711947/9d767.pdf
    • http://files.davidfullerentertainment.com/uploads/1/3/2/8/132814343/7240146.pdf
    • http://xuzivas.coulterhouseapparel.com/uploads/1/3/2/6/132681556/zanog-raguboni-darunederif-basaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3772/7637/files/jorodod.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/fidonopabokadenavewi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/nomuda.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84407481133.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/fozajijatu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/adventure_communist_mod_apk_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/latekasomusupadenuve.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/98536789079.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/83720030185.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/92607042070.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/carrier_chiller_30gx_service_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0435/4847/5541/files/drunkards_path_quilting_templates.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_off000071d5.bin
2b1bbf2bf287fa5fe38dc230018a3f597d04f068dc7450d01dd897d024445f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D5 5524 bytes
font_01_sfnt_off0000848c.bin
f8e1a6f92d5f2521dcb408227e6115237aaa360c100bdf818f29c0ef5352e636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 14024 bytes

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