Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ff04aae44c7c85…

MALICIOUS

PDF

40.7 KB Created: 2020-10-06 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9877eb20b378a1f9b83037444bc68258 SHA-1: 846fcae485caabd145c62abd9b82833c4af53487 SHA-256: 42ff04aae44c7c8529b2d4bbb49e0f341f0e2ced78280a0dff50a8da8d161388
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is part of a link farm designed to host numerous external PDF files. The document body, though heavily obfuscated, contains the string 'Jay z discography download kickass' and a URL that matches the malicious redirector, indicating a lure for users to click on malicious links. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/strik?keyword=jay+z+discography+download+kickass
    • https://site-1037044.mozfiles.com/files/1037044/21703238673.pdf
    • https://site-1039553.mozfiles.com/files/1039553/zolawexaxazifes.pdf
    • https://site-1036873.mozfiles.com/files/1036873/felap.pdf
    • https://site-1042983.mozfiles.com/files/1042983/92264163607.pdf
    • http://vadinu.tkotupperware.com/uploads/1/3/1/6/131636627/f4249e53.pdf
    • http://fulewam.hambleden-wi.org/uploads/1/3/1/6/131606666/839b9.pdf
    • http://files.lovettadvisors.com/uploads/1/3/2/6/132695334/tuzetenozapevik.pdf
    • http://posapasa.healbflo.com/uploads/1/3/1/3/131398455/zifazopuvepax_sodamekuxar.pdf
    • http://files.alumniumf.com/uploads/1/3/1/3/131381605/519552.pdf
    • http://tigoxige.isabelleduchene.com/uploads/1/3/1/6/131606402/8876804.pdf
    • http://files.upcowildandscenic.com/uploads/1/3/2/7/132740951/1309486.pdf
    • http://verufom.iaptprn.com/uploads/1/3/2/6/132681579/83ac5cc91dd2.pdf
    • http://files.thegoddessattainable.com/uploads/1/3/1/8/131856695/1197409.pdf
    • http://jevagil.japanskitours.com/uploads/1/3/1/4/131407995/3a7e6b33a41f5.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_off00005ee2.bin
4f7f43bb4622a700f378dec94c8efec689fef575c1f349c3bdad811e031b5856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE2 5632 bytes
font_01_sfnt_off0000722c.bin
beed9e72c4cfb7ebc263d7054fdb515686f6846319aa8a02a3ae28e6bb629350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722C 10440 bytes

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