Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0fe3491cc83dc9…

MALICIOUS

PDF

43.9 KB Created: 2020-08-03 06:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0863012033588f9382f3b535c8c925f5 SHA-1: ac4c0e9a2ef0385479ff8f4e02ce788fbcfbfec5 SHA-256: 0b0fe3491cc83dc96951ae86e7c33a6c3c326b01530297af58f7c7dd1b2b0fac
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for free music. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

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=free+hawaiian+music
    • http://files.brazildanceco.org/uploads/1/3/2/6/132682790/niwafuzepuxiwax.pdf
    • http://files.berlinperspectives.com/uploads/1/3/0/7/130776205/45dcb87e6738dda.pdf
    • http://files.threesistersgardens.com/uploads/1/3/1/4/131453062/5892548.pdf
    • http://files.topnamsausage.com/uploads/1/3/1/4/131437438/sobulenara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/88227120704.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/59086039896.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8489/files/gikum.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/befave.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/32753878249.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/centurylink_router_login.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/soseb.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_off00006c94.bin
c1dcbed878bcfcd346fa0dcb2cc3a1bd9f7ee20687ac97cab333a286346ffb42
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C94 5052 bytes
font_01_sfnt_off00007dae.bin
78cbaac2529f8db0e4c132de04b1bec725c99cb95851153c682feb0eb97e1082
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAE 11096 bytes