Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a70c5ac7fa0d465…

MALICIOUS

PDF

51.2 KB Created: 2020-08-16 19:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 999f478f40ff06420a3b8c41ace502ac SHA-1: c5a9a0f6819fc4ad5d5f5c411ce25b3723d0e490 SHA-256: 3a70c5ac7fa0d46518ed0760915ed2b0272f2f698899941ffdfff68cf957d20d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL is https://ttraff.cc/pify?keyword=manualidades+navide%25C3%25B1as+con+cd+para+ni%25C3%25B1os, which is likely used to redirect users to a malicious site. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=manualidades+navide%25C3%25B1as+con+cd+para+ni%25C3%25B1os
    • http://files.elizabethtownchristianacademy.org/uploads/1/3/1/4/131437615/83090b8d0c.pdf
    • http://zerujoji.arnikafuhrmann.com/uploads/1/3/2/7/132740228/pikuraxubarum.pdf
    • http://files.wakecountybands.com/uploads/1/3/2/6/132695354/bfb8c99fe8357.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/fosuwakejeloto.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/naparizedasolekadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5895/3369/files/74944449629.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/38020507904.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0822/files/noxitamolilifujekididet.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7644/files/zozitenezavitovonasur.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/igbo_worship_songs_mixtape.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/92378770325.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/kufakezojunuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/sownik_angielski.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/61987440658.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6017/files/rurakafarapejolokisaj.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_off00008637.bin
3460414f872a7e5170479ad61fcbfa61a3a01fc7a2f6688aea7dabc657ffa1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 5344 bytes
font_01_sfnt_off00009834.bin
03a1226f5e29f3e7a79636c382432136cf4d4f656e9a521abda6d5c7c45d9007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9834 11496 bytes

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