Malicious PDF — malware analysis report

Static analysis result for SHA-256 857394b6a21c8918…

MALICIOUS

PDF

43.5 KB Created: 2020-08-31 23:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf8b1398bed7bc7aff382a4ea0ae496 SHA-1: 83ed1f4d1530d9054179d3ff9ea43ba324328aac SHA-256: 857394b6a21c8918644518c3fdb78484bce2eac64d350aba948a812133b980b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a search result for educational content. This suggests a phishing or scam attempt to redirect users to malicious infrastructure. 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.com/wix?keyword=orthographe+ce2+exercices+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/d9d1f5_537956dd82534f4fb706142f5d6635b5.pdf
    • https://static.usrfiles.com/ugd/73cb9e_2ec7f00a2968499082d175ca31cc9e6c.pdf
    • https://static.usrfiles.com/ugd/09c3c7_80f7bf84e90e4ce1918a808aa502c0a7.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/laudate_dominum_mozart_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/4553/5400/files/zoderusutukudubiwobav.pdf
    • https://cdn.shopify.com/s/files/1/0428/1758/5308/files/anchor_bible_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/rowakuzogudabesegafeduj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/613898374.pdf
    • https://static.usrfiles.com/ugd/98857b_c5a7316d4b084943829cf7c7a85a692b.pdf
    • https://static.usrfiles.com/ugd/f0f215_ad8ec9c1e6704732b8d106f8cb790e95.pdf
    • https://static.usrfiles.com/ugd/9e53d4_39a641c563154a8b99bb0ca31fc2b807.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/nememiliji.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/vudukasadapuzarobu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb2.bin
555bed76513c8828da04a4d3e50f020fbf8ae2746347f4a9d427daf0b545efdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB2 5296 bytes
font_01_sfnt_off000070dd.bin
ab7e9f54b0f0b86f6c6134ce6a862cc310765dcd2786e20f4dbb513ffa92621f
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 10308 bytes
font_02_sfnt_off0000934e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x934E 4324 bytes