Malicious PDF — malware analysis report

Static analysis result for SHA-256 6228e1fd68d37752…

MALICIOUS

PDF

45.7 KB Created: 2020-09-11 00:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 901c54249f969041ec6ed20db2005918 SHA-1: d4ae1a2d94a2b59ad4df9a0d28d8467067570436 SHA-256: 6228e1fd68d37752d21e98737d1b0cc39cc954713ecd64055e9bcf3c665bd315
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier also strongly indicated maliciousness. The presence of multiple links to external PDF files suggests a link farm or content aggregation tactic.

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.me/wix?keyword=arduino+language+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c33f71_713485621ad84c19af6cac62621ff8cf.pdf
    • https://static.usrfiles.com/ugd/85c99c_949c1a7d8cca48008422f355ba0aa364.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f8343cff1d749209f13e85b872057f1.pdf
    • https://static.usrfiles.com/ugd/c12414_3c09e845c1cf46009317df5df45b11ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_32f73daafee8453a929d6bc293af174e.pdf
    • https://static.usrfiles.com/ugd/0df15e_9cd8e4d2c08b4045a029023581b4dc25.pdf
    • https://static.usrfiles.com/ugd/67f5f7_395129aa70924ad1bedc65117b8d40b8.pdf
    • https://static.usrfiles.com/ugd/529385_d2a8082374f540d6a34238ba1df684c8.pdf
    • https://static.usrfiles.com/ugd/9eb187_b28fda2b6c69493aa168df882cddeca5.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/83222544276.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/fupitozu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2501/4684/files/fagenonemugivosowilufobov.pdf
    • https://static.usrfiles.com/ugd/9d7ad9_bef48cff25d044649aa3a53d423475c0.pdf
    • https://static.usrfiles.com/ugd/de3d83_5e51c416b8f546798c59d83b132c48c4.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007552.bin
340a29f6c41d0af6b3bd381d1394371922887979cf359ccd366f15d8be0f4efa
pdf-font-stream PDF embedded font (sfnt) at offset 0x7552 5020 bytes
font_01_sfnt_off0000867a.bin
cdb42dc10f5cf15c4c7812375c92be219badf465587c570a4f958b812d10c70a
pdf-font-stream PDF embedded font (sfnt) at offset 0x867A 10640 bytes