Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8d36fe017c5776…

MALICIOUS

PDF

71.5 KB Created: 2020-08-24 23:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 226a05474b035da83873104af2a24a8e SHA-1: 449f14f9d88ff2406adf213e73484867c6fa02ef SHA-256: 3f8d36fe017c5776ce43f154b82214ae9619653b6c5bf5b2e1ad8040d6622bb7
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to the topic 'angle properties of intersecting lines worksheet pdf' and includes the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of a malicious payload delivery or phishing attempt.

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=angle+properties+of+intersecting+lines+worksheet+pdf
    • http://vidojuxi.myeto.com/uploads/1/3/0/7/130775166/111b6f.pdf
    • http://files.slumberadventures.com.au/uploads/1/3/0/7/130738712/2472636.pdf
    • http://vapigupi.saintgregorysileby.org/uploads/1/3/1/3/131380934/kotebogisarisaf-folijoma-rojugizaj.pdf
    • http://povifi.manubio.com/uploads/1/3/0/9/130969336/jimabawi_mimisexexo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/gilazibepa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2101/files/303201883.pdf
    • https://cdn.shopify.com/s/files/1/0430/7854/9665/files/xakugegemova.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/nauka_angielskiego_free.pdf
    • https://cdn.shopify.com/s/files/1/0458/6428/8409/files/sumamelumamog.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5760/files/betibopuwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/69620368608.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/87132342163.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/8001/files/90865855227.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bccf.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCF 2828 bytes
font_01_sfnt_off0000c6ca.bin
c07c5e57bb2711907a693db7baf31a88154baf5047d0723799079a57842980c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 5352 bytes
font_02_sfnt_off0000d90b.bin
09d3c8656cf43288a38cffb36eeaf7de10a567beca97e69f7dd1b797f486c946		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 10024 bytes
font_03_sfnt_off0000fb98.bin
4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16072 bytes

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