Malicious PDF — malware analysis report

Static analysis result for SHA-256 266798594ec91c9a…

MALICIOUS

PDF

41.8 KB Created: 2020-07-12 05:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 990e372ebc3ccebdfb155d5c732f8006 SHA-1: e07b0a59488563969fbf3bf2ed59a79caf6aefb2 SHA-256: 266798594ec91c9a21fe5971deeaa09e215dc114699ba5b0a88d3acf0d5938c8
150 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a link farm designed to host further PDF documents. One prominent link directs to a known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'TCS SAS interview questions and answers PDF', suggesting a lure to trick users into clicking the malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=tcs%20sas%20interview%20questions%20and%20answers%20pdf
    • http://files.swimscaape.com/uploads/1/3/2/6/132695418/junibuvogo.pdf
    • http://files.pvnewsguild.org/uploads/1/3/0/8/130873907/51c3043a91.pdf
    • http://files.mortedomar.com/uploads/1/3/1/4/131453024/kitepiwi.pdf
    • http://files.techniquejobs.com/uploads/1/3/1/3/131398540/gavov.pdf
    • http://files.ntx.afaparents.org/uploads/1/3/0/8/130814161/kosoxi_vamedama_jitug_dodefifofemiju.pdf
    • https://jaxajuneko148236911.files.wordpress.com/2020/07/webanonotegajejozasana.pdf
    • https://dunudojuzo.files.wordpress.com/2020/07/52500731788.pdf
    • https://jadulotixen.files.wordpress.com/2020/06/nizuru.pdf
    • https://petafasuja.files.wordpress.com/2020/07/sipovuzi.pdf
    • https://zuxanevoxe.files.wordpress.com/2020/07/69539381424.pdf
    • https://nuvosunogad.files.wordpress.com/2020/07/5871964441.pdf
    • https://nalawerap212150830.files.wordpress.com/2020/07/26050610907.pdf
    • https://xunewoweki.files.wordpress.com/2020/07/50935675747.pdf
    • https://gadaxug.files.wordpress.com/2020/06/xebatejekatodawarusi.pdf
    • https://tikurogeti.files.wordpress.com/2020/07/bawinovibesoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/73676382282.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/nitasadunojoniwuwamejumir.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/95175420129.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/34685129539.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/58055245251.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_off000062f6.bin
54751c5f4a0db673e83aa52c61b86c22b70fee32fd95601b6256cbb80fd038c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5224 bytes
font_01_sfnt_off000074cf.bin
6a33d3f04619687fcf8a63deebd0d66c222ff19f2f6c487066fad00e7dc1ed77
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CF 11080 bytes