Malicious PDF — malware analysis report

Static analysis result for SHA-256 696c8cf0b2749eb3…

MALICIOUS

PDF

48.3 KB Created: 2020-07-08 11:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4268b0430870cb0473d559997215eb SHA-1: 4372d0e082b3d8aca64ebac5f5c3963250a9e9bc SHA-256: 696c8cf0b2749eb371da9f63e175ef35e024f45d064ff1070195c66fedaa9f54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, identified as a link farm. One prominent link directs to a known malicious redirector, while others point to numerous external PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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/wb?keyword=lakme%20flower%20duet%20sheet%20music%20pdf
    • http://files.lkoc.org/uploads/1/3/1/3/131383497/bofepowoj.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdf
    • http://files.sbcopywriting.com/uploads/1/3/2/7/132740218/644292.pdf
    • http://files.rjhomecontractor.com/uploads/1/3/2/7/132740398/b386d19.pdf
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdf
    • http://files.pamsteashoppe.com/uploads/1/3/1/3/131384789/59b03f6f49c09c.pdf
    • http://files.mortarandpestleproductions.com/uploads/1/3/1/4/131407823/3555731.pdf
    • http://files.zamdevelopsj.org/uploads/1/3/1/1/131164534/7449164.pdf
    • http://files.tarotartist.net/uploads/1/3/2/6/132681938/8280551.pdf
    • http://files.shodacars.com/uploads/1/3/1/0/131071035/mujig-podasavikuxiro-jolijifajene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://zetawofuzuti.files.wordpress.com/2020/07/poligixokeguv.pdf
    • https://jiledudosiso.files.wordpress.com/2020/06/sesowob.pdf
    • https://voxemodu.files.wordpress.com/2020/07/rolodofufer.pdf
    • https://gefasiku.files.wordpress.com/2020/07/10653361982.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006762.bin
53883cfe19a74b75fc236820a41c4b8f5088c269ceb57739b9fb4b34530c31a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 5268 bytes
font_01_sfnt_off0000796b.bin
905b8eb5f509bf224ebda12fe2b9548ab05611b66d589212a761177ce764f278
pdf-font-stream PDF embedded font (sfnt) at offset 0x796B 10576 bytes
font_02_sfnt_off00009d9d.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D9D 16120 bytes