Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ad4608fc0186e1…

MALICIOUS

PDF

45.9 KB Created: 2020-08-29 15:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f4a66a5489f2feba022048ff5f83a3 SHA-1: b158eb0be18314cf6eee67190233aed8ff84e747 SHA-256: 95ad4608fc0186e1f3b341253684db674776f752afffc8859cd02955151a79b8
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify and static.usrfiles.com, suggesting a link farm for SEO manipulation or to host malicious content. One of the embedded URLs, https://ttraff.com/wix?keyword=definite+article+with+geographical+n, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated.

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=definite+article+with+geographical+n
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/31066816747.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5591/files/artifex_mundi_games_free_full.pdf
    • https://cdn.shopify.com/s/files/1/0438/2110/5309/files/foxabovodipojaxus.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2506/files/stewart_james_calculus_7e.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/guide_dogs_for_the_blind_oregon.pdf
    • https://static.usrfiles.com/ugd/b8c837_4217c47c694f461ab008ac654aa86682.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdb5030780234191b93f561bbb4bf0f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_0759cb939b984ca4a676b2b052153210.pdf
    • https://static.usrfiles.com/ugd/15cd4d_2268798f4a1a499285e575d09b2c9543.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a2a32c4edec44e8b0af498f39596da7.pdf
    • https://static.usrfiles.com/ugd/b8c837_62820aa7407f4a74aae379d055a23c7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ee56da3962946a6b66980bc93c3630a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f6e631406a947208f6286d43a2ee115.pdf
    • https://static.usrfiles.com/ugd/ca32a8_0a8fdbc22b724e00a080d7a75af1fecf.pdf
    • https://static.usrfiles.com/ugd/b8c837_40f97e0fbb804426817f6eb5bfaa3cf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a37ec38b1a34ec982127b418537f6c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce6250a253c848d9bf17ad1eedaefbd7.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_off000076e5.bin
f6330840350148ae1870bbb9f2718e100ce93f4603dec081b4dd0373ba04991c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E5 5188 bytes
font_01_sfnt_off0000889c.bin
51623d51fe128519c66f83cee485500df78ad97e285829bae2f3a23be283868b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x889C 9964 bytes

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