Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efbc98a7a943063…

MALICIOUS

PDF

41.0 KB Created: 2020-08-26 11:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a4fed2d565b6a41216a5ac7b7abc55 SHA-1: ea85572af3ebd62af4e3ecfca632fd9c6860b85b SHA-256: 4efbc98a7a9430636e46ce736947ac44b69f56564b196521a67b5e31de74b790
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known to host malicious content. The document body, though partially corrupted, contains text related to 'Akbar birbal ki kahaniyan in hindi on pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure.

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=akbar+birbal+ki+kahaniyan+in+hindi+on+pdf
    • http://zakixol.eastbayareatherapy.com/uploads/1/3/0/7/130776106/visanelivigogafone.pdf
    • http://files.steindoodles.com/uploads/1/3/0/7/130739633/23b08da.pdf
    • http://files.herbanspamassage.com/uploads/1/3/2/7/132712676/1414c04972811.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/69365411990.pdf
    • https://cdn.shopify.com/s/files/1/0447/9136/5792/files/vertical_aerial_photography.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/97812900155.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/80203767424.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/pudojedeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/aoe2_bombard_tower.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/indirect_object_pronouns_guided_practice_4a-_4.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/how_to_run_a_web_server.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/vupewekiregaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6338597663.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/xafovo.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_off0000543b.bin
cc660bc6d677a209d1c7e9c87c357d6f245ceffb4dd04e500941aedefb87f579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x543B 5248 bytes
font_01_sfnt_off00006604.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6604 1800 bytes
font_02_sfnt_off00006e91.bin
079281b1ead8ce7defe8566a29c926e9edfe83e2b1d0e5140c6d3dd1583cb20d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E91 12672 bytes

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