Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a7e96061131d93…

MALICIOUS

PDF

42.7 KB Created: 2020-08-02 21:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b05caf429788810c52b8c58caa0dd72f SHA-1: b0f1af6d1723f2867c8b55fbe5a3dd6cbd858dc9 SHA-256: 16a7e96061131d932c133669f1d49712145f3f66d3a18fcf605a66305910b512
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=tanka+poetry+example'. This indicates the document's primary purpose is to redirect users to malicious sites. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent.

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/pify?keyword=tanka+poetry+example
    • http://files.mygara.com/uploads/1/3/0/8/130874012/6b68104b96c90e.pdf
    • http://files.my-bwk.com/uploads/1/3/1/1/131163564/998973.pdf
    • http://files.devonpixies.com/uploads/1/3/1/8/131857650/jumavakurov_wopizuxonevi_nosadobi_gironuje.pdf
    • http://files.teachamantofishhaiti.com/uploads/1/3/0/7/130740200/batonopova-wepefed-bimoni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/80836428919.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/kuvapopetupegilifupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0958/8897/files/xedose.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/tewuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/2905/4118/files/kexatujiwupuvubufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/jatukozijisikakugizumujad.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0598/files/tutorials_in_introductory_physics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/julusesexuxoxovupatino.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/namiruvebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9356/5342/files/zogemazojap.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/91509412020.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/98144253933.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_off00006877.bin
553de78fce77dd5dc3392f218e094a5a7cb8dd91ca126f5ad6e9e46652b017c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6877 4972 bytes
font_01_sfnt_off0000795e.bin
6e5bc38aed60d11beed400d20ae55b2e4d5d6b5a742e3ff50714e3f09f1abca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795E 10760 bytes

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