Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78af28621417b00…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 09:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb1c32b09e7a019c9ee65186c574361 SHA-1: a16bb9b1dfa867d0c2a41c992d95533124959685 SHA-256: e78af28621417b00f4235b352a16531d2eeb5853a91db6c200f398a9cfefd6b8
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'interview questions and answers' and the redirector URL also contains this keyword, suggesting a lure. The PDF is flagged as malicious by ML classifiers and contains a malicious redirector link. No scripts were extracted from this sample.

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/pify?keyword=interview+questions+and+answers+for+retail+pdf
    • http://files.travelinforlove.com/uploads/1/3/1/6/131606366/594458.pdf
    • http://files.heidisproductreviews.com/uploads/1/3/0/8/130873917/5f452b8d0a214.pdf
    • http://files.ndmnfundraising.com/uploads/1/3/1/3/131398194/1221503.pdf
    • http://files.lagom-online.com/uploads/1/3/0/7/130775191/tobaxowex-rufofevux-tabovesilimi.pdf
    • http://files.tockwithjuniors.com/uploads/1/3/1/1/131163613/2733291.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/calculus_by_swokowski_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/multiple_markers_with_infowindows_google.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/witofonivezaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/jitiwazowasosobusol.pdf
    • https://cdn.shopify.com/s/files/1/0451/0502/1091/files/maluneroloza.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/analysing_qualitative_data_gibbs.pdf
    • https://cdn.shopify.com/s/files/1/0447/4103/4135/files/abdome_agudo_vascular.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/kukajet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/81765167708.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3398/files/ashlynn_brooke_naked.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_off00006d82.bin
8072d58800a111443616e01fbe5c4e1c86d99ed40beeaf86c70e052ed56919e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D82 5252 bytes
font_01_sfnt_off00007f82.bin
e0e63b0cc1e73f5fa9b8e0ceebb5c7607ebd00098e8979311c36ba5171f653a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F82 9836 bytes

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