Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8c427e1490fec7…

MALICIOUS

PDF

47.4 KB Created: 2020-07-28 19:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c31d5954970bbd59d94b8f5aac03573 SHA-1: c144a2f32ee225957b052a18312652edb586b7cb SHA-256: bb8c427e1490fec78053720efec8c9110eb71e23688fcc67d103708b3ac16b4e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the redirector link and the link farm heuristic strongly suggest a phishing or redirection attack.

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.cc/pify?keyword=orange+audio+songs++ram+charan
    • http://files.mmodesteamericanhistory.com/uploads/1/3/0/8/130873895/tizasodowinedos.pdf
    • http://files.sweetonketobakery.com/uploads/1/3/1/4/131408027/9364282.pdf
    • http://files.karenwilliamsjungianpsychology.com/uploads/1/3/1/0/131070674/ec861c2496390.pdf
    • http://files.hugedogge.dk/uploads/1/3/2/7/132710763/4e5f729711b841.pdf
    • http://files.emporiabasketball.com/uploads/1/3/1/4/131437724/galumazu.pdf
    • http://files.emporiabasketball.com/upload
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/fukulibaxobufuwuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99640144283.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9247/files/ruxujukuvudusede.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/sinuzoleta.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/lagakasokofumunavazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/dobuzezarekofanudonokebo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/94324263836.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3383/files/vumuziwitapet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2388/3688/files/vepimokulumagaxisijijeje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/58586760865.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_off00007d60.bin
5467fa619fc5a132e1e17b86034e4e3876eeadd6dc99432597f6d8f35d2c7e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D60 5152 bytes
font_01_sfnt_off00008eaa.bin
6ab078afc1feed2a24efb837478289eb2b3010cb8d3efd483062f9d9c1cfa05b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAA 9864 bytes