Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d13d4e0d0279d7…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 10:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ede34d5ece7a6fcf5205894fd8426642 SHA-1: 7cf3e7936e699d5dfe0a088b6fd5cfa69d566465 SHA-256: 76d13d4e0d0279d7db6c148274b8a60213746807a020d7103bac2148f50d3493
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which, 'https://ttraff.com/wix?keyword=tactical+radio+quick+reference+guide', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to drive traffic to potentially malicious or spam content. 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=tactical+radio+quick+reference+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8412/0225/files/adobe_premiere_pro_cs4_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/piredoluxovatepalixovoga.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/86575655040.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/busch_gardens_williamsburg_map_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/0821/3670/files/77215265654.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89e83c56a534753a28d456d7097e665.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/71117022806.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/22126332329.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/kuladiwexemuwirunoram.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/modovaxidetakililegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/71113175843.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/57274623141.pdf
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/kadabipa.pdf
    • https://cdn.shopify.com/s/files/1/0464/0545/1931/files/coreldraw_2019_crackeado.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_off00006e71.bin
c445f6a5c88d58e4eafff87053555e55f1ea92da75f9f077f0d1cbd3f533c977
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E71 5148 bytes
font_01_sfnt_off00007ff2.bin
4ee768df610ca3ec2426c11620ba0729d5bd1c30d24ee1e88f77d04d499d4dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF2 10880 bytes