Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf9f3af05ded238…

MALICIOUS

PDF

34.2 KB Created: 2020-08-28 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97e994543bb324601ed340479ac2864 SHA-1: f04b7ac04b33707018853140a3556c101c9302f3 SHA-256: 1cf9f3af05ded238ca60d0b8985fc476cb9035389a2092eecbc04904d90307ac
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though partially corrupted, includes the same URL and references sheet music, likely as a lure. The presence of a large number of embedded links, many pointing to Shopify, suggests a link farm intended to obscure the malicious destination. The ML classifier strongly indicates 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=hava+nagila+saxophone+sheet+music
    • https://cdn.shopify.com/s/files/1/0431/8098/2438/files/formulation_of_functional_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/regenoradedazorazafo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/59519487114.pdf
    • https://static.usrfiles.com/ugd/b8c837_067fd5a819054fd1a5076994dc77ec65.pdf
    • https://static.usrfiles.com/ugd/b8c837_669cf7f73d7d47788a173a295d4e4d50.pdf
    • https://static.usrfiles.com/ugd/b8c837_598d6818cebb42b9a47e2967aa1b1525.pdf
    • https://static.usrfiles.com/ugd/b8c837_24aea0c63e874923a51c64b47926ef78.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f08fad810a54e01839bdafd1b2ee5ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_749827de5268404b836fd0d1bf8d7952.pdf
    • https://static.usrfiles.com/ugd/b8c837_463de93d2f4c4289be6300a96b299f5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbb0d3a6468c4f348c6ca5ee6f45e002.pdf
    • https://static.usrfiles.com/ugd/b8c837_207b4d899bf84769bf205cc39dfc9b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b25b80b365d4e4b9469ac05a284220d.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_off00004820.bin
b6ffb74bfe739762a606ec8a21faf3a9fb1be141b963bcbf2266c7b394896ed3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4820 5340 bytes
font_01_sfnt_off00005a2e.bin
51ca9188636a38a3dbf0198e62de447ad7440d028c7c2831fa94c7a36299adcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 9968 bytes