Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3877625b1099e06…

MALICIOUS

PDF

39.2 KB Created: 2020-09-20 16:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f6d96d7f2e1f0e700bb9aae839abf9f SHA-1: 37adacf0efc93cab11899b8b3bc41f4c8486f7b1 SHA-256: b3877625b1099e060515897c326e1d02dd1f2296f1b7bd5e46ec562dfcd1e594
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing indicating it is a malicious redirector link, pointing to a URL that appears to be a lure for a military manual. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The file also contains a large number of embedded URLs, many of which are hosted on suspicious domains, suggesting a link farm or distribution mechanism for further malicious content.

Heuristics 3

  • 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.
  • 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.link/wix?keyword=falcon+4.0+allied+force+manual
    • http://vudonisug.ycinvited.com/uploads/1/3/1/3/131379163/nibujezo.pdf
    • http://files.centralcocfamily.com/uploads/1/3/0/7/130738628/5596051.pdf
    • http://files.fourthgradestingrays.com/uploads/1/3/0/7/130740049/7449715.pdf
    • http://files.clearhrsolutionsd.com/uploads/1/3/1/8/131871786/d1eaed.pdf
    • https://c19b4353-3903-4842-b204-0cbe4bd57865.filesusr.com/ugd/b14caa_8cc3751fe9d2467e96d643f351d89144.pdf?index=true
    • https://dd585fae-3d5a-4439-b9f5-d8bb90b7adc4.filesusr.com/ugd/bd5c68_52a09fba934b4596b4cb1fd80f906de1.pdf?index=true
    • https://3b3f7c0a-681e-4289-a38b-ce1d2e09298e.filesusr.com/ugd/370b54_5c4ceb1afea746438afe085c1b7244cf.pdf?index=true
    • https://e3033614-8926-4a6a-8e21-c8dcf52b3276.filesusr.com/ugd/069df5_7144e6cc0f2349e2a690f27c19fc8c16.pdf?index=true
    • https://24d18891-bf91-4dff-a9b3-c82759bf3f48.filesusr.com/ugd/6e13d9_3309b5a90df341e990857d30d461f66a.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/bringing_words_to_life_beck.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97098861098.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/44192887642.pdf
    • https://cdn.shopify.com/s/files/1/0484/4224/5278/files/ximodazo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b6c.bin
cd75b5292f665e21cded7c105f5a1523788136b3f4d5f9fe75ff36781e9d628a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6C 5208 bytes
font_01_sfnt_off00006d18.bin
a207c497a40a7d0f9d7fe1590ae6fc0a576c2a6e665f787245bf6a73768c3a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D18 10432 bytes

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