Malicious PDF — malware analysis report

Static analysis result for SHA-256 121642d455feaf60…

MALICIOUS

PDF

71.6 KB Created: 2020-07-28 05:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe6371956686d4c08991d8b127838ae8 SHA-1: 130b5ce64523ba8add1fa1cd660a79685912990c SHA-256: 121642d455feaf600f4509ab8adec62dc038291257bb1009cad7af81f5adc1d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.com'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, with one example being 'cdn.shopify.com/s/files/1/0435/6567/8755/files/badurefodunetobod.pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=android+appcompatimageview+tint
    • http://files.vanderphotography.com/uploads/1/3/1/4/131409090/gomes-josusik-jigevifikek.pdf
    • http://files.meganelysefulmer.com/uploads/1/3/0/9/130969989/1429833.pdf
    • http://files.givetoothers.org/uploads/1/3/1/4/131455621/divile.pdf
    • http://files.acupuncture-integrativemedicine.com/uploads/1/3/2/6/132683088/sodazufefinonov.pdf
    • http://files.bororunning.org/uploads/1/3/1/4/131408369/noxugegavimiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6567/8755/files/badurefodunetobod.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/tosiwukiwabavibofaxiten.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/punim.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6269/files/mitabufelavufidiwebogez.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/pawumazokewuwir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6490/1270/files/30981123835.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/12548413352.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/62698258748.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/vupesinenigof.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/sufoxiref.pdf
    • https://cdn.shopify.com/s/files/1/0434/6744/0290/files/vikapesite.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/13521703261.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39e.bin
d21e86c0827693f64337d21ad8f0fb51f9f71b09464aeadfbcf28451302a1050		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 5112 bytes
font_01_sfnt_off0000d4ed.bin
966106b28ae8f1330d826459814e5055f6d81c3513c9841a50410ef819790710		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 1880 bytes
font_02_sfnt_off0000de04.bin
d70a09f3c05a519f1d7911803cc4eb7cb2ed54abab2a7d8d5ef690c964967d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16204 bytes

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