Malicious PDF — malware analysis report

Static analysis result for SHA-256 811e431ebb25c52d…

MALICIOUS

PDF

62.8 KB Created: 2020-08-06 23:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d374799bca3a094f5b23f060898d24d3 SHA-1: da3ab20baf6ae11a94dcafd2eb014c3230f5c931 SHA-256: 811e431ebb25c52d724b3423f9de81161706509bb50d05f2dca12cd31d4d599f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious redirector links and the link farm technique suggest an attempt to lure users to harmful content or manipulate search engine results.

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=99+names+of+allah+and+their+benefits+pdf
    • http://files.cplproducts.net/uploads/1/3/0/7/130775936/5144620.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://files.troyargenbright.com/uploads/1/3/0/7/130738836/87b833510dfe9f.pdf
    • http://files.mult.honest-elections.com/uploads/1/3/0/7/130775448/lonan-vudapanesozigud-xizuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2584/files/34764016663.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/tukirigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6569/4613/files/maneritedawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0440/3901/2502/files/12592726934.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3370/files/convert_to_text_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/nikon_d40x_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/performance_appraisal_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/3981/6861/files/84338728494.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/18929081506.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/bozotudepejefixin.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
stream_006_off0000ba18.bin
cee02ac678b259e3d24969b483c131f9bc86d54450511886d810c188dd375be9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBA18 28912 bytes
font_00_sfnt_off000085b2.bin
20b7398463f128460554eba04854b636d7251b30d06a6246fa2fe31d41e02ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B2 5484 bytes
font_01_sfnt_off0000981b.bin
342fa534e0f223a24b27a9ad54aeed42dfd5f872738527063d2687ae27efbe00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 9864 bytes

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