Malicious PDF — malware analysis report

Static analysis result for SHA-256 681b7fac0bd8c0d4…

MALICIOUS

PDF

44.7 KB Created: 2020-09-18 16:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef75610104d1b4ef37348ee8340ef20 SHA-1: 84026377146931f0547eaaf13204cad655fc941f SHA-256: 681b7fac0bd8c0d48064a2eb35a35143ff7c36095970cec201ab856ef6bdcc30
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate the PDF is designed to link to external, potentially malicious content, and the ML classifier strongly supports its malicious nature. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links, suggesting an attempt to redirect the user to a harmful site.

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.me/wix?keyword=james+fallon+the+psychopath+inside+pdf
    • http://files.foreignlanguagedepartment.com/uploads/1/3/2/6/132695194/suriwit_tuzipazajaj_fegosa.pdf
    • http://files.sinisterkiss.com/uploads/1/3/0/8/130873758/galemu_xevuganuv_gujemexodupiru.pdf
    • http://files.littlegreenjeep.com/uploads/1/3/0/7/130739744/5467582.pdf
    • http://files.freekidstories.org/uploads/1/3/1/3/131379054/wapixabotopu.pdf
    • http://files.oxfordpard.com/uploads/1/3/1/8/131856956/nubemadelizubelu.pdf
    • http://files.pantanobaptistchurch.org/uploads/1/3/0/7/130775465/8292829.pdf
    • http://favik.honeycreekgoldendoodles.com/uploads/1/3/1/8/131856917/baxaxun-kasevelilobono-zidagexatumanix-najifuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3757b694-0e7f-4096-9c47-c8ede6d3c5b4.filesusr.com/ugd/105a8c_3c873d101f2a452cb1ac8b005162116d.pdf?index=true
    • https://5593f4f7-bdfa-4d29-a22d-163711bc6d1d.filesusr.com/ugd/c57cae_c571cdbbf17f4e109e850c89911b332c.pdf?index=true
    • https://33f86bc8-11ca-4dca-8feb-8d7f14ef835b.filesusr.com/ugd/1479de_a5f794febe8e4c6c8406d8d56cf7037f.pdf?index=true
    • https://bce2bc04-a825-4d52-ae37-03df342a4ce9.filesusr.com/ugd/07ef24_679b3c912c9648bcb3d96336af85d6dd.pdf?index=true
    • https://b4da7474-9b14-45db-9477-73c0fb3d5797.filesusr.com/ugd/e80f4c_0dbe542f48a84571bc7bce407defe1df.pdf?index=true
    • 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_off00007196.bin
c99b88490ad00b8e88df2d2df2f87be037370fb2437025616ac5d0902fd5079e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7196 5392 bytes
font_01_sfnt_off000083d4.bin
235f6e2d19e8f64ca55c833a3c3e0b7f321bd4243a8725f92f5f6c0d4001ec51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D4 9984 bytes

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