Malicious PDF — malware analysis report

Static analysis result for SHA-256 379678654b3d2a69…

MALICIOUS

PDF

38.8 KB Created: 2020-09-11 04:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9a57d68aa496e1d12d36ea358db10c SHA-1: 747b0386e4ee8cf8197d6a9c7b46b6a7c863401a SHA-256: 379678654b3d2a69e141c39613b185c92fee6de835d907c968bc845f349a148b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=baby+funny+video+dance'. This link is presented within the document body, suggesting a social engineering lure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=baby+funny+video+dance
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/9500584687.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1600/files/fopujapaloguroweduribu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/96901467192.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/towetigifu.pdf
    • https://static.usrfiles.com/ugd/4c4e45_6f16983963704605a5292a93535ee772.pdf
    • https://static.usrfiles.com/ugd/0aab01_f83dcb03d2604343857b4ac79340673c.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/marching_band_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/api_testing_using_postman_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/charlie_malayalam_movie_hd_720p.pdf
    • https://static.usrfiles.com/ugd/03f576_f6f52479180f4203a58b8ca927451f56.pdf
    • https://static.usrfiles.com/ugd/a474dd_99525bfdcaba4d1796611f16fb7494f9.pdf
    • https://static.usrfiles.com/ugd/49be48_674d3bc1c7474f14b333e440e1f68e21.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_b6d15b248cb342e1a7e667b1f45b44cd.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_off00005a23.bin
c60424fe12753c5b228943653f1761aafd050de8c2e223d6a042b904d60421d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A23 5060 bytes
font_01_sfnt_off00006b85.bin
cc56206d46f7ee0ed131356df0dbc0a73f0223fdd125c3488cea65795fe5b794
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B85 10316 bytes