Malicious PDF — malware analysis report

Static analysis result for SHA-256 c301a492d9636122…

MALICIOUS

PDF

41.3 KB Created: 2020-08-07 17:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ef478843364685475831c2704b1123 SHA-1: 0cc57ac68da462fcd6e9b7199805103331eaa03f SHA-256: c301a492d9636122861325bec7f86897807dcd900ef13221e62f7019a32a06dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=pdf+skf+bearing+catalogue, is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to 'PDF skf bearing catalogue', suggesting a lure to disguise the malicious intent. The presence of numerous other links to Shopify-hosted PDFs, while individually benign, contributes to a link farm tactic. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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.com/pify?keyword=pdf+skf+bearing+catalogue
    • http://files.drydesign.co.uk/uploads/1/3/0/8/130814205/tevurewegukemi.pdf
    • http://files.latvsff.org/uploads/1/3/1/3/131384432/melam-duxan-goxujororaku.pdf
    • http://files.ccwestlibrary.com/uploads/1/3/0/7/130775520/jirunejebusanuzikax.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/surah_ar_rahman_with_urdu_translation.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/durevaxizadowatuviguraj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/67420976969.pdf
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/bendigo_bank_term_deposit_rates.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/zepanamejobitiwebiv.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/kugilekukikirusixajam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/wavumabopasajenumig.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/dd_form_1610.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/xomasumajagibugizelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/laxin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/69425052855.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87960197539.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/17073758157.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bf.bin
df7fa9b05a69ab45e77e30fbb877cc5a01a9eb09d3548ef8f208d1d39917912a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BF 5396 bytes
font_01_sfnt_off0000772e.bin
06f26747a273d9bbc45eab4bebb6faf171c7d9e9e28cf5c12c7faf08099a02f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772E 9700 bytes

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