Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41bbc7fa51f68f3…

MALICIOUS

PDF

48.7 KB Created: 2020-09-16 13:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02886ec135513dfca05a80414da3af4a SHA-1: f9162002b8c8a0e2fa66fdc6ba33d70b99924245 SHA-256: b41bbc7fa51f68f3678b596ef42052a117dd0600aee7a41af50e1eb83101425f
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, disguised as 'examples of completed parent brag sheets'. One of these links, https://ttraff.link/wix?keyword=examples+of+completed+parent+brag+sheets, is identified as a malicious redirector. The presence of numerous links, many pointing to Shopify domains hosting PDF files, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=examples+of+completed+parent+brag+sheets
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/ap_polycet_hall_ticket_2016.pdf
    • https://cdn.shopify.com/s/files/1/0461/8341/5971/files/99248076780.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/17157419014.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/approximation_questions_for_ibps_clerk.pdf
    • https://cdn.shopify.com/s/files/1/0441/2204/6616/files/berliner_platz_2_neu_testheft_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/que_es_bienestar_laboral.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/64437441773.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/sukofogasebafufokeguba.pdf
    • https://86ba7022-003c-4204-b998-fe89cfb49f55.filesusr.com/ugd/bf650e_8e9c768e59fb4f77a26dc8c3808a2920.pdf?index=true
    • https://cf2beb9b-2d83-4e1a-bc33-a5e65a185e3f.filesusr.com/ugd/154db6_e1b81d3291bd46a18b7935363dee4256.pdf?index=true
    • https://054bb1ca-f808-11ea-a328-fc4dd43d38a6.filesusr.com/ugd/d775a9_bb362e18c25343068c6d1d54df956a04.pdf?index=true
    • https://d12b36ab-8644-4dc1-b413-a13d82a6d7bd.filesusr.com/ugd/89064d_e3b96bc8a0c444cc97cc51b57b96de49.pdf?index=true
    • https://588c4f28-f06e-4085-882e-939ca294e987.filesusr.com/ugd/c722c2_396cdfae73114d20885f57f9881c3eb0.pdf?index=true
    • https://f915a33e-f807-11ea-a328-fc4dd43d38a6.filesusr.com/ugd/9ef0c3_4541a83cf6a3405ca5ea10b951df6fe5.pdf?index=true
    • https://1f29e04a-aba8-46c7-8979-78e8f150f660.filesusr.com/ugd/33ab24_a83a6edac0344e48a252f39608286e5e.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f9a.bin
6c76fe548bfd332e5953d0e6d943d403d09977cb8322a462c9cd36bc3f5e35d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9A 5732 bytes
font_01_sfnt_off000092ee.bin
311fd7ac0e17b947e2a287355c75f64b7f93d2306140dec5941d89c20d9fbd48
pdf-font-stream PDF embedded font (sfnt) at offset 0x92EE 10292 bytes