Malicious PDF — malware analysis report

Static analysis result for SHA-256 688e80547e0701c0…

MALICIOUS

PDF

48.7 KB Created: 2020-08-10 19:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84de38a10368a6d06eb7749e239e63cc SHA-1: d806ba11ed5d4d50be35db1fe80464da5a6e84de SHA-256: 688e80547e0701c0b6895deeaa1101c67dc464ebbb71dd2066fe29ca5b791d5f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body also contains this URL and numerous other PDF links, many hosted on Shopify, suggesting a link farm or content distribution network used for malicious purposes. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=convert+bitmap+image%2528.+bmp+to+pdf
    • http://sizukegux.jdscrafts.com/uploads/1/3/1/4/131406390/tudurawuzajuxut-fuxedugije-suzipeka.pdf
    • http://files.savebozeman.org/uploads/1/3/1/4/131408529/80336d.pdf
    • http://files.authorjon.com/uploads/1/3/1/4/131408798/b758d305ddd2f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1370/9722/files/93735637395.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/gun_mayhem_unblocked.pdf
    • https://cdn.shopify.com/s/files/1/0441/3738/2040/files/gabujexitowatitosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/serodutazejuki.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/69229990918.pdf
    • https://cdn.shopify.com/s/files/1/0440/0313/1542/files/ximikudusebegawudulefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5555796470.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/53636208163.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/4723873220.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/all_state_abbreviations.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6561/files/xijatavaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/64109181922.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654d.bin
6c4a390323110ef9a763aef6f071e6476eff312c512e267ac2f47bcc3f5417c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654D 5368 bytes
font_01_sfnt_off00007788.bin
93384e65d63c149358ca1263750392b0a4bb1fab92165d5be8c2b54d00e2f7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 15264 bytes
font_02_sfnt_off0000a105.bin
75fb5eda6c80430b94b20cb0daa906e0e98a9f633c3ecfcf71c743d7414a59fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA105 16076 bytes

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