Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73b175e7991ea7c…

MALICIOUS

PDF

43.5 KB Created: 2020-08-03 06:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21f8601d44d5ad05a6e402514eabd369 SHA-1: bdc583735f4ec68932a20f77da01db1d67947a73 SHA-256: b73b175e7991ea7caf6de6c9d08a63858adb23474ad30707756b37854c585f07
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting a lure to download further 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=brother+mfc-+6490cw+manual
    • http://files.cuctf.com/uploads/1/3/1/4/131438617/tuvutapafoxupo-ruwumu-jakilusadeneko.pdf
    • http://files.nationalriskmanagementgroup.com/uploads/1/3/2/6/132682731/9cc68260.pdf
    • http://files.dissertationmumbai.com/uploads/1/3/1/3/131384663/rexugavokakirerizi.pdf
    • http://files.brcc.myworldrules.com/uploads/1/3/0/7/130775970/wudolemilaxepu_relijopufapom_jokonujorejige_dizugif.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/pathfinder_adventurer_s_armory.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/dexalamuxekapupejap.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/woxumuligumava.pdf
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/36665251747.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mitev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/nutukogaxozaraneranipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/bugamezepakagasagemizeziv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/vezojutarejodes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/rogawski_calculus_early_transcendentals_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/benenijafovoviwazun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96280370261.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_off00005de1.bin
e5abab90492266d2ca21c1deae6ebb25e96a7ba6c677e60a9ba4bf8c2721b62c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE1 5488 bytes
font_01_sfnt_off00007085.bin
fa636cd6b19cd9dbcfadcf5f527a47198c3af2793b03001e8f8f7d9e5e8969b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7085 10144 bytes
font_02_sfnt_off00009330.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9330 4324 bytes

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