Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a615d919418511…

MALICIOUS

PDF

41.7 KB Created: 2020-09-08 06:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 104ec1687e9dba992e8b1b00937c7b78 SHA-1: c72a022421619d4d941b42028fc7cbdb850eb40f SHA-256: 45a615d91941851128b318e15f52083c35a54ba639f43c62f97ec64e69e4234d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.link/wix?keyword=aschenputtel+by+the+brothers+grimm+pdf`. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external PDF links further supports a link farm or redirection strategy. 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=aschenputtel+by+the+brothers+grimm+pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/26757871864.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/manurusubexageganadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0757/3157/files/agreement_format_for_housekeeping_services.pdf
    • https://cdn.shopify.com/s/files/1/0431/1226/7937/files/13194055792.pdf
    • https://static.usrfiles.com/ugd/ed2d23_069bd304a5af44b2846994b3072adad3.pdf
    • https://static.usrfiles.com/ugd/92ee2b_882c192a8cc947c094f2aa7193875da8.pdf
    • https://static.usrfiles.com/ugd/5ea4d5_506a4224ed2d42bb88e0bd2d7085907b.pdf
    • https://static.usrfiles.com/ugd/5ecadc_bb4dbb5dac664f49a1c077f0a7539f0b.pdf
    • https://static.usrfiles.com/ugd/5cd33b_434af15391f04e43b99f50d1df2e5a57.pdf
    • https://static.usrfiles.com/ugd/c20ea7_e563d47776f24e2d8c260f372e13e9ae.pdf
    • https://static.usrfiles.com/ugd/724bd4_c45239cf69f94220a227669fcdb6334d.pdf
    • https://static.usrfiles.com/ugd/accd1f_f5b878f4f7de44f18e8e8aeb02b14e67.pdf
    • https://static.usrfiles.com/ugd/704566_3eefa01e5b1f4989bb4919703cf9bc46.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_off0000665f.bin
ed159b1f41886247c5d114ebf6f12baac94f69725768c74bdd83bd9a89026ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0x665F 5592 bytes
font_01_sfnt_off00007940.bin
31ed252353a6fb05b7b0be70c19b70747c786ec2cf3c28974f7826d238c32a00
pdf-font-stream PDF embedded font (sfnt) at offset 0x7940 9612 bytes