Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6ab22b561d0a9b…

MALICIOUS

PDF

42.2 KB Created: 2020-08-04 21:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7504ec2590a2cd12578206e492e6718 SHA-1: a75b711793b581fd41f64e922afe8a83c7ba4385 SHA-256: 3b6ab22b561d0a9bf134b716ec097ea50db7d0659fccb8edb8dc9a5d94e2a690
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a workbook answer key. The document body includes the URL 'https://ttraff.ru/pify?keyword=genki+second+edition+workbook+answer+key+pdf', which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicates maliciousness.

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=genki+second+edition+workbook+answer+key+pdf
    • http://files.lifepathchurch.org/uploads/1/3/2/7/132711954/e0c383.pdf
    • http://files.gourmazingcuisine.com/uploads/1/3/0/8/130814052/9b6eaf.pdf
    • http://files.htecauto.com.au/uploads/1/3/1/6/131606140/916c6c11a.pdf
    • http://files.yewgem.co.uk/uploads/1/3/2/6/132681033/dc4a86.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/11513836389.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/29462061797.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/7163547941.pdf
    • https://cdn.shopify.com/s/files/1/0433/5583/2471/files/81606996416.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/vetusokisexaxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/59905100321.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/javascript_game_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/94902068048.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/tebolotakarelusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8177/6795/files/bruchgleichungen_lsen_aufgaben.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000569a.bin
06640ccf76e2daed1e3cea6854c121acf384ca520bc68f98264ff8a3c56e53f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x569A 3672 bytes
font_01_sfnt_off00006397.bin
07c90b325d8404bcd66c76978265d875c65c406e3b42dd84f9136f471b7dde0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6397 5544 bytes
font_02_sfnt_off000076a5.bin
d300daa349e6c3ec63b29ead750c3031b44625d45d3d39aa271cd46f1f9745c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 10756 bytes

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