Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffa2b7b0ca5b817…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 22:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 275322881aeb0faea1d2c2d204bbf343 SHA-1: 4fcc0d15c1f3abe7d075fd761739a54dd80c2e21 SHA-256: dffa2b7b0ca5b817afda1b0a64183a428ba443aedc34c123a59004e2c03ac8a9
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/wix?keyword=aging+concepts+and+controversies+ninth+edition', points to a known malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, suggesting a deliberate attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated 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.cc/wix?keyword=aging+concepts+and+controversies+ninth+edition
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/ripolivokinonafujudilum.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0920/files/59565822650.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/82840858467.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/89703741677.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/13916572297.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/courageous_woman_reading_plus_answers.pdf
    • https://static.usrfiles.com/ugd/c1de29_2005b26d5d194b239dcbd2d36b373228.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_e725b227927440c882183d9c556efd1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a36d9949354433ca8684a5763695c9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3457e671e6fb4533951ef01701bff528.pdf
    • https://static.usrfiles.com/ugd/f3cb45_d643b75aabe148ef85156dc404b96f69.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6f038eb6dce4d23bb1f7da16ae09421.pdf
    • https://static.usrfiles.com/ugd/d4da64_f9204d3c5f9f414c844bfe36df94891a.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_off00005e42.bin
01c1096af7515c55dd9c5010c2bf6ce7b8d55a9d3fe82da2141acf74b0939a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E42 5352 bytes
font_01_sfnt_off00007073.bin
f14a9eeb7dd6c78019d8c0e37b958d38f7cb4eb5ba62fe2b535d3be3ae95830a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7073 11696 bytes