Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b2eeabb7064d11…

MALICIOUS

PDF

50.9 KB Created: 2020-08-04 18:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ee0bd944c49e64b36d667cc2bc067e SHA-1: 07866ee896e3bb1bfa6be80828e0ad80bcbe1a94 SHA-256: 20b2eeabb7064d11b1862c6e6ea69b467128b967864bccefb645b4d95eac2696
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing indicating a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=active+and+passive+voice+formula+chart+pdf'. Additionally, the document exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The presence of these elements suggests the document is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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.cc/pify?keyword=active+and+passive+voice+formula+chart+pdf
    • http://files.sheldonheights.com/uploads/1/3/1/8/131872054/fodesamuguropopibaw.pdf
    • http://files.christian-marriage-counselling.com/uploads/1/3/0/9/130969742/2095671.pdf
    • http://files.mjconsultations.com/uploads/1/3/1/8/131856247/5219031.pdf
    • http://files.aquariusredang.com/uploads/1/3/1/4/131453288/6a7fa9840094932.pdf
    • https://cdn.shopify.com/s/files/1/0437/1539/5738/files/massey_ferguson_135_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/kixikifine.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/jupitonibu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/83715562626.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/south_lomei_labyrinth.pdf
    • https://cdn.shopify.com/s/files/1/0437/3292/6616/files/xamebibogowaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/jenaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9273/0275/files/uses_of_concave_and_convex_mirrors.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/6533439853.pdf
    • https://cdn.shopify.com/s/files/1/0447/6190/7351/files/definicion_de_bienes_y_servicios_en_economia.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/84952521572.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bf7.bin
9bf7f4aa7897a5b0ed66030ad462d93cb6dbcb572386f3c82207767370be6f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF7 5328 bytes
font_01_sfnt_off00008de5.bin
7126ea77a1aeeb03cda0896cb07467a7f80ca1e5f43d686290125dd844392e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE5 10144 bytes
font_02_sfnt_off0000b09a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 4324 bytes

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