Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d9244b10bd273b…

MALICIOUS

PDF

65.5 KB Created: 2020-08-24 01:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f066638f589f714b4e3a666531083b24 SHA-1: 179af0bf2d8b65dd75abef59e44dfeeba28e9e43 SHA-256: a4d9244b10bd273b8f4e62503cff1ee277fa68af218f6a8719aea26e055a793a
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links pointing to external PDF files, many hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=sestina+poem+questions+answers', is identified as a known malicious redirector. This suggests the document is likely part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure. No scripts were extracted, and the document body was heavily obfuscated.

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=sestina+poem+questions+answers
    • http://files.calebericksonmemorial.com/uploads/1/3/1/1/131163601/27924ab7d9cd781.pdf
    • http://files.countertourism.net/uploads/1/3/2/6/132682974/mojuxasatelupor.pdf
    • http://dijaj.alexandrakwilson.co.uk/uploads/1/3/0/7/130775583/9739368.pdf
    • https://cdn.shopify.com/s/files/1/0436/8554/4089/files/21322685762.pdf
    • https://cdn.shopify.com/s/files/1/0433/8758/4661/files/miguel_angel_buonarroti.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/tunuposewujovuwugosadowop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2244/files/millet_flour_bread_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/blood_relations_aptitude_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2103/files/rigixisake.pdf
    • https://cdn.shopify.com/s/files/1/0435/0155/1771/files/doodle_god_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/22889148124.pdf
    • https://cdn.shopify.com/s/files/1/0433/3083/0494/files/benivaduzaputowilonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/witavubawumarozinogiku.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_off0000c499.bin
37486b066a26b4bbae8ee066fb70de0aa6cbe57d3cc59aeafd3a038e00b515c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC499 5252 bytes
font_01_sfnt_off0000d668.bin
343f52f027b33813f1b5ab106821dc113efac415ee3b4a1ba3a17f7c841c529a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 10156 bytes