Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fc31065e99cbab…

MALICIOUS

PDF

33.5 KB Created: 2020-08-11 16:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63eab39cf34ea36c8402c276eec75b2 SHA-1: 93dbadb9f9590c2529353cd0a0ecd68e81e65d96 SHA-256: 57fc31065e99cbabd4bc410d8f53f191327144af2e661def3ec2e9265f94e4d8
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body and embedded links indicate a lure related to 'Cambridge English for Engineering Teachers book pdf', likely intended to trick users into downloading further malicious content. No scripts were extracted, but the presence of malicious redirectors and a high ML score strongly suggest a 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=cambridge+english+for+engineering+teachers+book+pdf
    • http://files.onceuponatimeinva.com/uploads/1/3/1/3/131383456/geravefivetaxoke.pdf
    • http://files.ameliahamiltonfit.com/uploads/1/3/1/4/131455463/pinukenuru.pdf
    • http://files.priestlysalvage.ca/uploads/1/3/1/8/131860787/peselavatowet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/pilodukunuba.pdf
    • https://cdn.shopify.com/s/files/1/0430/2202/4867/files/40929217454.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/morepanepuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/8270954337.pdf
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/34648913065.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/jajusiximalipopelepirova.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0439/2298/1032/files/40208218013.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/68526374933.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2038/files/lorosapamivuru.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/81694129431.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/tuwurigotizutafeju.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_off00004481.bin
6c15c25c13d33e213cf712a3d7e53d51928d769953ebc5386304f8d2efe8439d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4481 5680 bytes
font_01_sfnt_off000057a0.bin
9d411419fefde716e0dc2d843df99e907e942d607e64c19aac8d0b633bd0fd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A0 9668 bytes

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