Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41498921d1733d0…

MALICIOUS

PDF

46.1 KB Created: 2020-08-10 21:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2871074c2f389ccb97d7e2753940401e SHA-1: 501edf38f77616b7ac5a3ce7f18bd9f72cd3dc09 SHA-256: a41498921d1733d04acf61a97eb4c49b8cd3827ce449c7eb9702880aa9d188ec
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, which is characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to a known malicious redirector, specifically `https://ttraff.ru/pify?keyword=burger+king+menu+pdf+south+africa`, which is likely the primary malicious payload delivery mechanism. 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=burger+king+menu+pdf+south+africa
    • http://files.apwilder.com/uploads/1/3/0/7/130740363/jutixenajoromiv.pdf
    • http://tajegep.investphilippinestaiwan.com/uploads/1/3/1/1/131164250/6974af1.pdf
    • http://files.doublekboutiquellc.com/uploads/1/3/1/6/131607712/sedasopef-tawov.pdf
    • http://fisas.nsnamidyear.org/uploads/1/3/1/0/131071157/1c770f4ad8c3b5.pdf
    • http://files.mooneevalleymagazine.com.au/uploads/1/3/1/3/131378816/jowum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/hindustan_times_delhi_epaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/5782/3390/files/how_long_is_this_youtube_playlist.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/adobe_reader_download_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/34450825804.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/govelenobofufepowulawova.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/vifejinozawigonex.pdf
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/wadubixutexamitifanatune.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/nubipadovi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9172/files/adda_247_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1851/6637/files/napuwedusazekereveluzin.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/fuwedik.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_off00006302.bin
407d965ff3e81937cdbba1b2043afc29864c21235afa356c964ca052fb76283a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 5532 bytes
font_01_sfnt_off000075a6.bin
9f3af8827103cae55127826dd8ce55298555f8fb2dc849b28c62c08a316dee02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 11224 bytes
font_02_sfnt_off00009bab.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAB 4324 bytes

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