Malicious PDF — malware analysis report

Static analysis result for SHA-256 1116cb513062c6c4…

MALICIOUS

PDF

41.7 KB Created: 2020-09-07 15:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4917aaa68f854a5a28328a20ec43f269 SHA-1: 3e9194c6a16d000a66d157b7ab4bce169233a15e SHA-256: 1116cb513062c6c4e12c8cd55d7b6ad8867c7ccd6d69fb6162531265011b90e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, includes a URL that appears to be part of a link farm designed to attract users searching for popular media. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to harmful sites.

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.link/wix?keyword=bhojpuri+song+mp4++pagalworld
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_ec8fa0036ef7465ea804f506bcd2eca4.pdf
    • https://static.usrfiles.com/ugd/f9fac6_f75f856cb61b413aaab11c253a654836.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f616e64acc445bb8680d18500633610.pdf
    • https://static.usrfiles.com/ugd/bdc04d_0dfb5f61bb814ccd80f80389a2a1369c.pdf
    • https://static.usrfiles.com/ugd/451461_8890f766baad46969578b6637493a141.pdf
    • https://static.usrfiles.com/ugd/8d46c2_1b9badacef474a9787da83310aabff95.pdf
    • https://static.usrfiles.com/ugd/bc4951_b5ca7bcfa27348a8ac99e3319a64e47c.pdf
    • https://static.usrfiles.com/ugd/1e32c2_87d6fa8230ad4791a4413aadf6464c62.pdf
    • https://static.usrfiles.com/ugd/405339_72e6631d07c84adb90b6a333570a4d78.pdf
    • https://static.usrfiles.com/ugd/934fc3_cf6d4ae41b5d4bffb9721b308cb6d34c.pdf
    • https://static.usrfiles.com/ugd/f390e7_909f88216dce4668880657f2fa459f92.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2bbc7df612f44b98b4b924f4a1a7a61.pdf
    • https://static.usrfiles.com/ugd/d1d005_019d437d19f34202b3763b649895ffa1.pdf
    • https://static.usrfiles.com/ugd/5f226e_1c984a8f30474e93b53b3de091179484.pdf
    • https://static.usrfiles.com/ugd/ee4d88_c7375482a28649f2a9dcb38725060e7a.pdf
    • https://static.usrfiles.com/ugd/ce5d00_d17c42ca52ab4c8ab0953627a783da25.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000650f.bin
069737fc6e7402c33070ee4cd4cbcfc7fb4e08891dec5b8409e5e37698aa1386		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650F 5680 bytes
font_01_sfnt_off00007852.bin
e18c4975b0467cac8b8a495457f7fc42fba08a08d64bbbbd51ffc293fe3446b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7852 9816 bytes

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