Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67d844febc3609e…

MALICIOUS

PDF

73.1 KB Created: 2020-08-13 23:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36763e5df8f22e9afadb6341ec7dfb26 SHA-1: a3a29d84a754ca0ec78000a7dc0a344977bf29b5 SHA-256: a67d844febc3609e9ebc89c1de79c08123ff9f385c933195c274013b6c22e9df
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning model and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to cdn.shopify.com. The embedded URL 'https://ttraff.ru/pify?keyword=merit+badge+worksheet+personal+management' is the primary indicator of malicious intent, likely serving as a lure or a redirector to a phishing site or malware download.

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.ru/pify?keyword=merit+badge+worksheet+personal+management
    • http://files.cuttingedgepetservices.com/uploads/1/3/2/6/132681304/muguwaneditola.pdf
    • http://files.rambunction.net/uploads/1/3/1/4/131406947/e372f9096693b9f.pdf
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdf
    • http://vabor.sarahholder.co.uk/uploads/1/3/1/4/131483372/jurul.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/lajiluvumadabokubev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/12848443912.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/windows_7_boot_process_step_by_step.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/xopizuzarus.pdf
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/gurobi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/juvixano.pdf
    • https://cdn.shopify.com/s/files/1/0430/8838/0061/files/91103406468.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/femowadiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8584/0036/files/jilazan.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/verbal_reasoning_aptitude_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/33258376174.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_off0000d57c.bin
00e6abb1f0680def5c92f4c71449fcb4ae06e1e38411bc810b8d866e6e16bb44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 5676 bytes
font_01_sfnt_off0000e8aa.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 1800 bytes
font_02_sfnt_off0000f138.bin
29f6606847f0a753c4f9330ab3c740ee5bc7e1c9590242e9233bc52b5a7e2221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10908 bytes

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