Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23e909861034fcd…

MALICIOUS

PDF

33.4 KB Created: 2020-08-05 03:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09af9529f218a534a6565d1d2ec6e05e SHA-1: a666405a022d77a612295b5fb8eb5f3f5c0ccd98 SHA-256: a23e909861034fcd1db583704b5b4351088e4ea087c907730097a4f437c2c382
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=calidad+de+vida+laboral+libro+pdf', which is flagged as a malicious redirector. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination and potentially leverage benign-looking domains. The ML classifier strongly supports the malicious nature of this PDF.

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=calidad+de+vida+laboral+libro+pdf
    • http://files.sherlockhomesstl.com/uploads/1/3/1/8/131856476/2880916.pdf
    • http://files.plausiblephotographofjosephsmithjunior.com/uploads/1/3/2/6/132683088/0b85cf77a454b5.pdf
    • http://files.momspantrykitchen.com/uploads/1/3/1/4/131411857/buviluvune.pdf
    • http://files.engagewithease.com/uploads/1/3/1/3/131381109/9185981.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/gidulurifulaxazub.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6567/files/ichigo_all_forms.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/august_2020_calendar_cute.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/somekuladasiwisevonak.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/goloxibuvur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/40962726666.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/openstax_college_physics_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/zipomemoneva.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/bixos.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/minecraft_tower_ideas.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_off000044a1.bin
6461b46f3fd082210b09993a0e29da47cd7d297b300ab396f40f0c85446aa6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44A1 4960 bytes
font_01_sfnt_off0000558b.bin
261e33d94bb57b7d3606755512139074e9478348e62c67eefd170131842f5788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558B 10412 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.