Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5d5f3cbecb6a74…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 20:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6da28d414a00be0aa7526016a59fbac SHA-1: e439ab9d0a515d0a49c8668fe1d90dd61b5b0d5f SHA-256: db5d5f3cbecb6a745ebb98fdf6c0e53bce6bf2ef211722f1f2d62aac07f3136e
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, which is also present in the document body. This link, disguised as a free owner's manual download, leads to the ttraff.cc domain. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF documents, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=2000+dodge+dakota+owners+manual+free+download
    • https://static.usrfiles.com/ugd/a18aa6_0ee21b5b23b64b2ba122f1694f5f2f1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f37ad85f8bb4804a2d9f90703fdbead.pdf
    • https://static.usrfiles.com/ugd/b8c837_c89056227e6f45a3a5d8eed9a9e47951.pdf
    • https://static.usrfiles.com/ugd/6f9b04_7fbeb8f5ac6d49a2847af1b3ebcada6d.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/matlab_for_engineers_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/suposogom.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xubuniridilagununona.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/67892417188.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojijemorewowasimagaxo.pdf
    • https://static.usrfiles.com/ugd/79e0dc_6757438386b94430855eb41a943538bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_85b683329cbf49af976bf0801d980a5d.pdf
    • https://static.usrfiles.com/ugd/1b8612_c1ff55367358445a98945a7944075939.pdf
    • https://static.usrfiles.com/ugd/33c377_d296b958b29f444e8956532569849473.pdf
    • https://cdn.shopify.com/s/files/1/0435/4614/9023/files/bully_apk_mod_data_obb.pdf
    • https://cdn.shopify.com/s/files/1/0435/7213/4049/files/92269837332.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/tuvanokixakin.pdf
    • https://cdn.shopify.com/s/files/1/0428/7961/5142/files/aireplay-_ng_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2724/files/calendario_mensual_2020_mexico.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_off0000681f.bin
71de20d84c67ccdd4018d2758ccd5f5a4871a9496f946f8406b0345f328c9f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681F 5560 bytes
font_01_sfnt_off00007afe.bin
fa3d1e7e421c2a3870d6a0fd332036f6489d8d7eb91e079341c7b2eba0122fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 14632 bytes

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