Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fa0eefd79cad70…

MALICIOUS

PDF

55.6 KB Created: 2020-08-29 02:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbe9c1a464fc906d723bcc0d660b5717 SHA-1: 2dffcc1a25662189c500e2d22015082b88c61ad1 SHA-256: 44fa0eefd79cad708916b98970fcd9d67ccb40512f3d17ce3d02fd6dad304b20
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. It also exhibits a PDF link farm, with numerous external links, many hosted on static.usrfiles.com. The primary malicious URL identified is https://ttraff.cc/wix?keyword=java+software+solutions+8th+edition, which is likely used to lure victims. The document body appears to be garbled but contains the same URL.

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.cc/wix?keyword=java+software+solutions+8th+edition
    • https://static.usrfiles.com/ugd/b8c837_4163bf30943147c6a16d8248eb7af845.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0bb93717ae547a483ecad8353f8e0f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2164ccf0d0843f4af9243550a072e69.pdf
    • https://cdn.shopify.com/s/files/1/0435/8173/5073/files/kamutetebaforig.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/xobofenejuniropived.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/pabatezijal.pdf
    • https://static.usrfiles.com/ugd/b8c837_30ca9d38d8474d549094ef80b5c05124.pdf
    • https://static.usrfiles.com/ugd/b8c837_980e1393dd6346279d5be4732cd1654f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f53a7745d4554776b9e0693b659158fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0045a5acf644ecd8e81c7dd61163492.pdf
    • https://static.usrfiles.com/ugd/b8c837_6de06d3b573048e3a1efb3c1268c79d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_32d85d3777a84cb6bf354a2aba95f4d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_56e2a992cd1648e79a269c6445757132.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e04b37cf8234c69b4a55d7882f1f717.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_off00009157.bin
4ed94d50817b4296e90ad08c1eef28c01a5e52b295159a8f3bb99399499da20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9157 5332 bytes
font_01_sfnt_off0000a377.bin
c0f72e3d18cf854e0466298f6e2d4d34f4636c30fd77888e8ca42fe772a14b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA377 14888 bytes

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