Malicious PDF — malware analysis report

Static analysis result for SHA-256 a819741569dcfa28…

MALICIOUS

PDF

40.8 KB Created: 2020-09-02 19:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fab1a7021b5294b9d0e23153994e3c4 SHA-1: 15b35f96a6d1f48a4aa71e1f795066c1f044a37c SHA-256: a819741569dcfa2850c380c7d8597b97a70049fd8e246e8342e371339c5dfff7
152 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 'PDF link farm'. One of these links, 'https://ttraff.me/wix?keyword=amisha+patel+bigg+boss+performance', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other URLs hosted on cdn.shopify.com, suggesting a coordinated effort to lure users to malicious sites. 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.me/wix?keyword=amisha+patel+bigg+boss+performance
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/driven_harmonic_oscillator.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6357/files/72635480933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pedarivorenali.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/sumeturulozufanedo.pdf
    • https://cdn.shopify.com/s/files/1/0464/9022/2744/files/pabubesinajanaxowe.pdf
    • https://static.usrfiles.com/ugd/cafc24_1e47debcb793410c8f97be32bbe12d17.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_f3c84af2b4634b94af78cc7e9253d785.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_62bb79361a374c1dba95200ece1fc648.pdf
    • https://static.usrfiles.com/ugd/740d8c_9787c03c12304a98a0ae1eacf98fb90c.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9816/files/55182403413.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7207/files/reducing_stress_at_work.pdf
    • https://static.usrfiles.com/ugd/3e9e83_d3e4af7ce8f54125ae4d148160d7aacb.pdf
    • https://static.usrfiles.com/ugd/b56239_c78c074a78ee47fb82655e8199473f81.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_off00005d9a.bin
5d2faab875e3385e7f76c274d2c255d9e0e50e7451b69da88e2d6fa4312558a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9A 5556 bytes
font_01_sfnt_off00007059.bin
339442f8a04fdb0eca1e82c91e6754369ab0447dc2093548a5f00720175ea2f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7059 10636 bytes