Malicious PDF — malware analysis report

Static analysis result for SHA-256 187b3893b04dbdef…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 14:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb4bda9e5530636f82aee663dd99df5f SHA-1: da644b3318faf6ce153ee6394d23b7cb81e6c642 SHA-256: 187b3893b04dbdef1686c0e2fd571aaa5080503b6c8d632306bc5c8545f4a802
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to redirect the user to phishing or malware distribution sites, a common tactic for malicious PDFs.

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=titan+quest+dream+build
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/1106/7291/files/video_from_private_instagram_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/depozuxovoxunonax.pdf
    • https://cdn.shopify.com/s/files/1/0431/4621/5584/files/jabunukoseb.pdf
    • https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_920ece2f56c643e299f179c7d6249eb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c87dbd217165444982bf33fe136bafaa.pdf
    • https://static.usrfiles.com/ugd/eb6612_724d3a37442a493cb1a310463bedffd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb8f0d6663694b40a20dccc2731d356b.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/resutososozi.pdf
    • https://cdn.shopify.com/s/files/1/0456/9946/5372/files/19354781320.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0536/files/ignou_ma_anthropology_study_material.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ef.bin
9d5c9a8939a810b6c4ea490ca0be38832272c2e26ce1a6dae0f3807cc50426f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EF 5188 bytes
font_01_sfnt_off00007568.bin
86421cb76d36d2e4e92eb02b24bc1ab34f9ba84a152e38a0ecdef10c4bf4963d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7568 10180 bytes

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