Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bff8eed8049a69…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 07:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31ca80874b761d6c517859324843913 SHA-1: 76b8585c3aa80a912f80de6179a7c3e65b2d44bc SHA-256: 35bff8eed8049a690148cb18a153ce2252dc43e83a9e1b89387f172b994957bd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the same URL found in the malicious redirector heuristic, suggesting the document's primary purpose is to drive traffic to malicious infrastructure. 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.com/wix?keyword=comment+reconnaitre+un+bipolaire
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/alexander_nevsky_prokofiev.pdf
    • https://cdn.shopify.com/s/files/1/0446/6461/9171/files/modern_physics_tipler_6th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3861/files/tubizo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/11529602745.pdf
    • https://cdn.shopify.com/s/files/1/0461/0624/7332/files/4038744712.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4168/files/59943150710.pdf
    • https://static.usrfiles.com/ugd/b8c837_be214fdb81eb4cc782021535ec47c022.pdf
    • https://static.usrfiles.com/ugd/dd4472_c6ed81a2d38f4d47831de846d0594240.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_08728c799dc44a0292b3a17e03749943.pdf
    • https://static.usrfiles.com/ugd/b8c837_640f06cbb14741d880358ede14dec3c0.pdf
    • https://static.usrfiles.com/ugd/7c3584_00ff5aced4a142f3a136720314fc7213.pdf
    • https://static.usrfiles.com/ugd/b8c837_a35b832cc50148b8aeebe5931d5bafee.pdf
    • https://static.usrfiles.com/ugd/4c76bf_24a91ab3da494745b1e84cbd0126b3ab.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_off0000729f.bin
f15b1318aca306f57e88b03f89ae6ea496e154ab22e0a070240625a0f44057f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x729F 4948 bytes
font_01_sfnt_off0000834f.bin
41efcaf19687057e9ec09702aa22ae1a2fd83da7ec526262e8a0826d9bf5ae99
pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 12192 bytes