Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e44f7d10d5a45fc…

MALICIOUS

PDF

38.8 KB Created: 2020-08-31 12:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb19c47bbb4307e1656652287f1fda87 SHA-1: 3e25dff36ff033b23d38cab40e8bd209593cded2 SHA-256: 7e44f7d10d5a45fcfd04bed3ba5865770066e299ffb53857e84b966922d0d6f2
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many pointing to external PDFs. One of these links, https://ttraff.ru/wix?keyword=ibrahim+tatl%25C4%25B1ses+agam+agam, is identified as a malicious redirector. The presence of a link farm suggests an attempt to manipulate SEO or distribute further malicious content. No scripts were extracted, and the document body is largely unreadable binary data.

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/wix?keyword=ibrahim+tatl%25C4%25B1ses+agam+agam
    • https://cdn.shopify.com/s/files/1/0432/1312/7844/files/fazekudaliwaniwalej.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/bmw_diagnose_software_rheingold.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/drakensang_the_river_of_time_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/badusogasunapiwiwugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/xadapuvixetuv.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bee09a4693b4a918a656957d88435fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_93361cfb20a544a588f698f725911d9a.pdf
    • https://static.usrfiles.com/ugd/24853a_6a26d02fc04346a19f1b7ce76a34ef06.pdf
    • https://static.usrfiles.com/ugd/824332_474178f515aa4ef7af99b8c64b444068.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73295986d444f3382ac896738b636b8.pdf
    • https://static.usrfiles.com/ugd/7c30af_906166ac751c47859a19c56ec2c384f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_538a3004cfb24491a324444b13a946c3.pdf
    • https://static.usrfiles.com/ugd/565485_9d9279afe5594f0393b81133891e4066.pdf
    • https://static.usrfiles.com/ugd/74e905_1cb38adac32840699964806aa34c2757.pdf
    • https://cdn.shopify.com/s/files/1/0437/8384/8093/files/16644880362.pdf
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/kugefukegabekoxafixofamir.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/vubedixekosatalefulawo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/68135794415.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/trigonometry_10th_edition_solutions.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_off00005719.bin
71b180ba33099bd7f568fc76629c8e7ac29b72f24bfac9dad412689f91b3aaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5719 5208 bytes
font_01_sfnt_off000068a2.bin
ac3232f0a89f9a91b0def2acc152bdd27a71b42ea1de655cb6aaf120a27fdb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A2 11472 bytes

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