Malicious PDF — malware analysis report

Static analysis result for SHA-256 826496aa0e96682e…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 13:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb1e2c48918cd5c61e215b104e87f83 SHA-1: 4330b73063f5fc673ca705b5d27c05221a8de35b SHA-256: 826496aa0e96682e3817480ea48c208469f5f66fd26c0b2125eaa92553edc931
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=cubs+and+bulbuls+uniform+badges', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and a large number of other PDF links, suggesting a link farm or SEO spamming attempt. 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.com/wix?keyword=cubs+and+bulbuls+uniform+badges
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e33828_bc179d835a9f4f51bf4009621b3a21bc.pdf
    • https://static.usrfiles.com/ugd/21e6f2_4ef6c1bf5c29431fb3e439fc5204dfba.pdf
    • https://static.usrfiles.com/ugd/b7082a_f77374fba44848b0a01a1131daa138f4.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/93285075722.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2103/files/xivagefuxoxasa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/panokovuwuxux.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/98654333367.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_4356692d5c134378ab60049d43d46390.pdf
    • https://static.usrfiles.com/ugd/455f95_3b0a337a34dc43048346ce3e926c3547.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/suzabuvikikowifatope.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/composite_function_worksheet_answers_f_g-_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/jugoxidotagadew.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/circuit_analysis_problems_and_solutions_ebook.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_off00005e8f.bin
d6b0c98f1d4a2a0a172ac0379d2931ee7045659b22b4c124030b2280f8a9a4aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8F 5272 bytes
font_01_sfnt_off0000705e.bin
0a9bc5206c45a9a34df73f34e3038b8b8e3f7950e70acd9048a9e092d9cde351
pdf-font-stream PDF embedded font (sfnt) at offset 0x705E 10872 bytes