Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e2905dff3946ef…

MALICIOUS

PDF

49.7 KB Created: 2020-08-15 03:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9c5888fc108c323caf54589de927657 SHA-1: f16ee928fbd8869fffdeea95147dd27197096e2a SHA-256: c9e2905dff3946efcfefde09530c85ff2d227b71211acc7240b5fe5a7feed08f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=arabic+keyboard+pro+apk`. This URL is part of a link farm that attempts to trick users into downloading an "Arabic keyboard pro apk". The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on Shopify, likely part of the SEO link farm. The ML classifier strongly supports the malicious nature of this PDF.

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=arabic+keyboard+pro+apk
    • http://vikek.rainadance.com/uploads/1/3/0/7/130738546/75d42fb6b8889.pdf
    • http://melezika.peninsulaitalians.org/uploads/1/3/0/7/130739616/lobagezalomubus.pdf
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/buzogogupeduv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/7321860553.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/nugezaloxevopivef.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/libom.pdf
    • https://cdn.shopify.com/s/files/1/0433/3037/1738/files/vibetofuzigowulo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/negumetetabe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6857/8210/files/6643747530.pdf
    • https://cdn.shopify.com/s/files/1/0450/8326/3141/files/passive_and_active_voice_exercises_all_tenses.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/domevejegow.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/77168695540.pdf
    • https://cdn.shopify.com/s/files/1/0430/5905/2706/files/81055065652.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0437/2280/1306/files/more_agile_testing_book.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fab.bin
bc60eba9f786e6465df4b3ace96ec173e5dba127b585ed5a5be6184ca01ee66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FAB 5152 bytes
font_01_sfnt_off00006135.bin
4b2c53a9ebca111f0a79c18847404ec6f91ab95fb2e56e143fb4380dc69c5511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6135 8680 bytes
font_02_sfnt_off00007975.bin
0e4fa3bd9a08056a025174a8a907bd6d1931eb41d9c2315c98a186eadbe551a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7975 9444 bytes
font_03_sfnt_off000099fb.bin
3f34e0263a5a4ed4b4efe864c6ad2eb0de0ce84c6abdbf9838a83146d3d89d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FB 18500 bytes

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