Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a4e7c5a101b638…

MALICIOUS

PDF

48.6 KB Created: 2020-09-07 21:39:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d1e80f8449d19c3c6454e2249049d8ad SHA-1: e775bf1a575735e205224241d50b751c2d013f5d SHA-256: a8a4e7c5a101b638d73226db640ea7e14c160c06e283e3dcde008a5ac2936ac4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits a PDF link farm heuristic, with numerous external links, many of which are benign but likely serve to mask the malicious intent. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to lure victims to malicious content.

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.com/wix?keyword=ansible+template+blockinfile In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/e6092c_6d2ba197947f40a78a6b4195bf1c4354.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/735424_77f587c9c975427596cb25f0484a5c44.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/89363e_22bb9ecf9e8f4b63bf4dcf55c12bd9c3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1b7c00_3cd55e96aab949108070a28f69defba3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/hormones_of_anterior_pituitary_gland.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/zekoxevagogivijexiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7616/3486/files/tigisuposekelegevoweja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/i_knew_you_before_i_formed_you.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1056/4002/files/muslim_girl_names_list_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/lamaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3545/7698/files/list_global_npm_packages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/he_s_going_the_distance_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0244/5475/files/jijamakivoxoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 5044 bytes
SHA-256: 19c48f5758cd3b3c711d96fb664441a19f9411ba74ba78760460442749286ca8
font_01_sfnt_off000076ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EA 14860 bytes
SHA-256: 8d0cbd44c801f2da66958179767a2c3badc90b863232c2e436841d63195257e8
font_02_sfnt_off0000a561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA561 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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