Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5deda30d9c389e…

MALICIOUS

PDF

42.7 KB Created: 2020-07-24 15:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be62b2b741e9c5d18882acd425c0a512 SHA-1: 22e286de14e2c94afc8a65e6a959603194e631d1 SHA-256: ef5deda30d9c389e6debaba11e2060fafd9b404b74f9aba0bb1118733a30f1a9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to domains that host PDF files, suggesting a link farm for SEO manipulation or traffic redirection. One prominent URL, 'https://ttraff.ru/pify?keyword=acceptable+forms+of+id+for+a+job', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to job applications, indicating a social engineering lure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=acceptable+forms+of+id+for+a+job
    • http://files.azaharaong.com/uploads/1/3/0/7/130776363/vusoru-gigaze-zosowuw.pdf
    • http://files.thejawnygroup.com/uploads/1/3/0/9/130968935/mezen-kalovoli.pdf
    • http://files.yellowsnowproduction.com/uploads/1/3/2/3/132303138/piropulirivo_vurerena_mavukor.pdf
    • http://files.yellowsnowproduction.com/uploads/1/3/2/
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/93241649489.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6003/files/33838468646.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/moworeziximif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/magemajemiduxipavudoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2738/9851/files/34784537372.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19490865332.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/38181857893.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/65418060272.pdf
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/77289078024.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/50136791896.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/13010987370.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2069/files/rebivejipinesowijasa.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_off00006a7e.bin
30714b185be513936536c05c89b6830917b8649f916646b2d0bb2c14d10650f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7E 5188 bytes
font_01_sfnt_off00007c10.bin
648ee8ed1c2008ab164cede72c00d7741230d5f8e7df2b0089a7e79a1231abfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C10 9928 bytes

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