Malicious PDF — malware analysis report

Static analysis result for SHA-256 815fe7a7ab643008…

MALICIOUS

PDF

32.9 KB Created: 2020-08-24 08:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd0e587b8a202b2a05888d70ec39b229 SHA-1: 7edb3c25e3d87eaf2c2c173ae684b077c53e0a2f SHA-256: 815fe7a7ab6430089b87dce41ae5b8dd511564bcc6966e58ac1b81a9cbec2efb
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=angles+in+polygons+exploration+answers'. Another critical heuristic identified it as a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on malicious links within the document.

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=angles+in+polygons+exploration+answers
    • http://files.asweetpetitedesigner.com/uploads/1/3/0/7/130739971/pogeg_zajed_favuzizu.pdf
    • http://files.oksart1.com/uploads/1/3/0/7/130776350/paragiwonida.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/pamukojibamilowepolezi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1537/files/16451889916.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/93630602196.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/vakarokodejakofudimize.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/bexoxosozipuwot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/gisevowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/fiwajopusi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7729/4485/files/where_do_i_begin.pdf
    • https://cdn.shopify.com/s/files/1/0433/9849/6412/files/bisamajedipalusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/fomokiromov.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/kukam.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/niworamolivo.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_off00004495.bin
62b6fe085da5a18632919e7f0601445e6d2edf29ce53dafa7f9b22937704c429
pdf-font-stream PDF embedded font (sfnt) at offset 0x4495 5236 bytes
font_01_sfnt_off0000568f.bin
8e75238503818d6c8f99cc433564c611f28b9e0e134e1f442d2f2419dd59e1db
pdf-font-stream PDF embedded font (sfnt) at offset 0x568F 9500 bytes