Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba37aeef7d5e30…

MALICIOUS

PDF

47.8 KB Created: 2020-08-29 23:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbf40c1a392269219ccecc94f6545acb SHA-1: c1764c55283e4eaf29fe64dfc1fb3f892d013471 SHA-256: 81ba37aeef7d5e3047e26666176305b97daefe4624c35451acb89454c4a96086
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a malicious redirector link disguised as a 'military psyops manual'. The link, 'https://ttraff.cc/wix?keyword=military+psyops+manual', leads to a known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier 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/wix?keyword=military+psyops+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0c268c_6b6ccf4162974364a8d224bb994702c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c87ea941250c487e8e6f9527c2a4aff2.pdf
    • https://static.usrfiles.com/ugd/353d00_6038c3164d39436f95bab5df0d84baad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/10518586219.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/arthashastra_in_kannada_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/74401145152.pdf
    • https://cdn.shopify.com/s/files/1/0438/4935/1328/files/75553016221.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3483/files/31007491556.pdf
    • https://cdn.shopify.com/s/files/1/0439/0636/7656/files/3517536337.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9510/files/506_assignment_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0438/2516/8544/files/remo_in_telugu_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2309/files/pepinifuvoxak.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ba776081e1a4b24b12f870d08ffc894.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c131cd4cbad45bc85f6eeee93fa6c88.pdf
    • https://static.usrfiles.com/ugd/b77b08_d1132b49516446c9a4ad0b1037a085a5.pdf
    • https://static.usrfiles.com/ugd/0c41e7_ef9c6406ff4c409d92bd1ed231abb2a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c881a4cdd3a48caac3f3699895b18b5.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_off00007e09.bin
e8b4aa5f3bdbe4dd645d2a60d5849ce672ce2874818a4ef22b8b68ac0ac3c78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E09 5072 bytes
font_01_sfnt_off00008f37.bin
399d04da68bb78216d8e3afb96dd99ecaff72ef62f69365aad4285330f2fc2e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F37 10192 bytes

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