Malicious PDF — malware analysis report

Static analysis result for SHA-256 85626b9f7e6f0c84…

MALICIOUS

PDF

41.9 KB Created: 2020-07-18 08:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad629c8d699a1b3fa3dc9111fd736f76 SHA-1: c5e1c1069418562df10a35da9cb219888983d493 SHA-256: 85626b9f7e6f0c84fe1e8a98c1745e23e2876a21cb4e31bba428571db8d1a7a7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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://ttraff.com/wb?keyword=articles%20grammar%20worksheet
    • http://files.cnycommunityacu.com/uploads/1/3/1/4/131453982/5284345.pdf
    • http://files.acadianaplumbersassociation.com/uploads/1/3/1/3/131381721/nifumodikamunib-xuzevedaxelogon.pdf
    • http://files.aggielions.org/uploads/1/3/1/1/131164387/kosoka.pdf
    • http://files.evadowdinternational.com/uploads/1/3/2/6/132681665/564467ae.pdf
    • https://pamowuvesez.files.wordpr
    • https://xanosaxa.files.wordpress.com/2020/07/migajiwilopupizut.pdf
    • https://nubudin.files.wordpress.com/2020/06/webol.pdf
    • https://xoxapuziri.files.wordpress.com/2020/06/76219333994.pdf
    • https://nodezebibun.files.wordpress.com/2020/06/45321680690.pdf
    • https://pamowuvesez.files.wordpress.com/2020/06/72248271809.pdf
    • https://kogezes.files.wordpress.com/2020/07/nodisugonakefejaxepa.pdf
    • https://zapuwujila.files.wordpress.com/2020/07/kedotakagobovovitusalubom.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/97741316284.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/70897917576.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/maseri.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/vovogiwosuvamazapejub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/88638696024.pdf
    • https://cdn.shopify.com/s/files/1/0436/3884/9694/files/radada.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/basubaninaf.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_off0000663b.bin
4a898421488d4db292bfd054222f3cfda6ae75ccf79748e56690021c0fc755b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 5040 bytes
font_01_sfnt_off00007766.bin
8e17baaa072b7b96f66199b4540aaaca8b0d286e6d7ee7bfdb7a9f4911e341b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7766 10252 bytes