Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c596da49b6eeb4…

MALICIOUS

PDF

53.0 KB Created: 2020-08-10 04:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17a8aa7e3cca5f2cb43b7ed90fe071e0 SHA-1: c5fa234d7f86c49b9cbdc6fc0f1e67a4465f1ff9 SHA-256: b5c596da49b6eeb4957f07f88521a17f158d23c0992eddbaf17d76d0791a13c0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=professors+bcs+book+pdf+download'. This URL is likely part of a phishing or scam campaign designed to trick users into downloading further malicious content. The document body also contains this URL and numerous other links hosted on cdn.shopify.com and other domains, suggesting a link farm or SEO poisoning tactic to attract victims searching for specific content like 'professors bcs book pdf download'. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence 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=professors+bcs+book+pdf+download
    • http://files.marinlivinghomes.com/uploads/1/3/1/4/131453429/sudumaxowirezeru.pdf
    • http://files.meadowparkpto.com/uploads/1/3/2/6/132681308/3850307.pdf
    • http://files.xugarkulture.com/uploads/1/3/1/8/131856234/521c617fb.pdf
    • http://files.immaculataschool.org/uploads/1/3/0/8/130813988/76ab218c2.pdf
    • https://cdn.shopify.com/s/files/1/0431/1577/4108/files/83656519832.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/mudinukisowuvafanesor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/rexevebekatomulijufamuw.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/titaxak.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/jiwolipovad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/toxonexuxanulesifugodim.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8573/files/mercruiser_alpha_one_gen_1_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/92571002794.pdf
    • https://cdn.shopify.com/s/files/1/0436/0136/3107/files/9669387545.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/advanced_d_d_player_s_handbook.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056f7.bin
3b8cfe65cc0b2aa088979a8dacf143988bf586ccdfbc1f866bd7af50bb567a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F7 5104 bytes
font_01_sfnt_off00006860.bin
2f87d5bf60b3a96652931d356de9add4f1b1525b501fcd7e08c873f1bbfc0448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 12524 bytes
font_02_sfnt_off00009000.bin
773806d6d0155488e4d6ca518ff4b4fa27c96e4c9b7f106f90ebc94a2fa85429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9000 12648 bytes
font_03_sfnt_off0000b897.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB897 4324 bytes

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