Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7af4846413e3acc…

MALICIOUS

PDF

43.4 KB Created: 2020-08-19 00:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bb150bdd129ac01b9745f99c514697 SHA-1: e780bd8b1adad12f717b415d12f5393ed95dbd86 SHA-256: b7af4846413e3acc2626b253f0c786e39d795fb65df3b293ba55ab064cdf10fc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=chrome+os+apps+android. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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=chrome+os+apps+android
    • http://vewawal.tiffanyfostersmith.com/uploads/1/3/1/3/131398097/xuxeve.pdf
    • http://bawotin.naplesbesthairsalon.com/uploads/1/3/0/7/130739930/putusela_tapufemifagotob.pdf
    • http://files.bournemouthjrc.co.uk/uploads/1/3/0/7/130775918/xetiwafuxax-filopu-lefireroxusa.pdf
    • http://files.facepaintingparadise.com/uploads/1/3/1/6/131637240/f9a4a18f5c4a0d.pdf
    • http://subos.thirdwatchpublicsafetyequipment.com/uploads/1/3/2/7/132740748/dasiboka.pdf
    • https://cdn.shopify.com/s/files/1/0428/8996/9820/files/jurnal_budaya_jawa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4439/files/domeligumukutejo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8607/6309/files/kutuxoburipizutarinojafoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/pifaguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/wamajonikivirolitowibi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/gerd_ldemann.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0274/files/answers_to_questions_on_notice.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/motorcycle_operator_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000614e.bin
050a612b3e941584770c52c116c31fd1046088fb452aef3a31b223be9880647b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614E 4900 bytes
font_01_sfnt_off000071bb.bin
96781b7eed5222382d372fe36172f17fe844fb1298e5e690fb97858803c775a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BB 9764 bytes
font_02_sfnt_off000092f5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F5 4324 bytes

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