Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f483f4af3931d80…

MALICIOUS

PDF

64.6 KB Created: 2020-08-12 04:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06a9e6bbac6b4ac46367f2f141afca0 SHA-1: 173f106a964fca357d4aff25ec69a869f0342854 SHA-256: 8f483f4af3931d80d85975f3cb4a5f7c19d4e5bc7528d22ccf220685d231ee49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external PDFs, which is indicative of a link farm designed for SEO manipulation or to host malicious content. The primary malicious link, https://ttraff.cc/pify?keyword=benim+hocam+tyt+soru+bankas%25C4%25B1+pdf, is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=benim+hocam+tyt+soru+bankas%25C4%25B1+pdf
    • http://files.mariaevagorou.com/uploads/1/3/1/4/131453252/a03cfe4.pdf
    • http://files.starwheelprinters.org/uploads/1/3/1/3/131384214/3830577.pdf
    • http://files.the59edsel.com/uploads/1/3/1/3/131380042/9244822.pdf
    • http://kekuzase.catholicyouthbhm.net/uploads/1/3/1/4/131454696/2596225696a0.pdf
    • http://gexarumut.yeeg.co.uk/uploads/1/3/1/6/131607240/e0d448b2a8.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/6044140433.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/creative_chordal_harmony.pdf
    • https://cdn.shopify.com/s/files/1/0453/2423/9003/files/6350806018.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/global_business_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/zegowiguwefinebobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/42712994358.pdf
    • https://cdn.shopify.com/s/files/1/0431/4592/0669/files/arco_asvab_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4422/files/modutunosejajorixitozel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5342/4540/files/vaporesso_tarot_nano_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/77823138475.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9487/files/18603796913.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5831/files/59520473733.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6b5.bin
a7078c5da90b3ab53d01689dddb9cfc69e8bc7e6398278a909db2d91c5571455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 5748 bytes
font_01_sfnt_off0000ca1b.bin
b908581f4b5352689c94adba0bc09f3435ab465dede0340bfcc89e3b0fcf594c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1B 13604 bytes

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