Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b5ad1aac8a3e7f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 15:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24d47dc35f0fb6d5e5dd21f8d81200c2 SHA-1: 4a677d5775120eb3da428b15e1fac009336ea828 SHA-256: 98b5ad1aac8a3e7fe1b9dbd578717075e074bbe974428a81549cf4e71bab3ad2
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a critical heuristic due to its extensive use of embedded links, forming a link farm. One of these links, https://ttraff.me/wix?keyword=dual+sheath+redux+load+order, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains this same URL, suggesting a lure to a malicious site. 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=dual+sheath+redux+load+order
    • https://static.usrfiles.com/ugd/e2c6c1_d0feed72ff34447eb6d111fd5b3b0bdf.pdf
    • https://static.usrfiles.com/ugd/87d215_aaf0640c24e040e4a79b41f7ae225401.pdf
    • https://static.usrfiles.com/ugd/b8c837_02aa42f81d644e0993de17950c2cb1a6.pdf
    • https://static.usrfiles.com/ugd/50c35f_2e179086d7a84d83918cd1d5d4c56427.pdf
    • https://static.usrfiles.com/ugd/0f5b72_100db773361a42aabfaf005f4db1b594.pdf
    • https://cdn.shopify.com/s/files/1/0467/9906/1141/files/pokemon_insurgence_complete_guide.pdf
    • https://cdn.shopify.com/s/files/1/0466/7847/4917/files/fadosifevadodufulexovu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/mee6_delete_messages.pdf
    • https://cdn.shopify.com/s/files/1/0434/6442/5622/files/46316208650.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/vefupefasewojekafixe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/nnpc_aptitude_test_past_questions.pdf
    • https://static.usrfiles.com/ugd/3aca14_272c481d125342bb9bdcec172729c443.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d676fac3c16416daff89c9e793e820e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6aae4917859e4932aac2d8b100caaea6.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_77bb982bd9074689818228579b9a120a.pdf
    • https://static.usrfiles.com/ugd/67e251_665716df578f488d9a9120edc3ba5987.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_off00006e6e.bin
3d25282f58924566cca53cd50094b1c4359ab053c9850e10c37ad759963c2e59
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6E 4980 bytes
font_01_sfnt_off00007f57.bin
7bc3aeed4e1a3f5c55d989a3814e6d1828de6cccdef3c761a05205ca7ae965ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F57 11488 bytes