Malicious PDF — malware analysis report

Static analysis result for SHA-256 163aab71474a972c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 09:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78c2fd9dad39e6b1010678b44a492025 SHA-1: 5a44bdfe2e450bf985cd19efde0c7f5da78dd9af SHA-256: 163aab71474a972c4dfb194bf94d567c6c0ee69730efd0b66fdc20274a3b4435
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 'https://ttraff.me/wix?keyword=caillou+party+fun+and+games'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including 'https://static.usrfiles.com/ugd/b8c837_d08cb33ae5f14941bfc7375b4b153197.pdf'. The ML classifier also 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.me/wix?keyword=caillou+party+fun+and+games
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d08cb33ae5f14941bfc7375b4b153197.pdf
    • https://static.usrfiles.com/ugd/b8c837_f521d7e0de444cb08eeb6e89e57dbc35.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e8a88e7e51e4582ac51e7d219dc9ab9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2eecdee29784c1c8d0bee0c9c889d87.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71d7067b8c44dc19fc0fc4162e34183.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/pomopawogejavifen.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/fanitasubazun.pdf
    • https://cdn.shopify.com/s/files/1/0449/9944/2590/files/double_cardan_joint.pdf
    • https://static.usrfiles.com/ugd/b8c837_59fa1813d14a48b384a6d51b8831d1e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a911e26fe49407cb70aabc445ede21a.pdf
    • https://static.usrfiles.com/ugd/b8c837_cee92d8717b9425ca8309b0d9d641a30.pdf
    • https://static.usrfiles.com/ugd/b8c837_9698d9746ec44ffb9c18193521fbafa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d09ffebd3a0548338f097d7359f8c037.pdf
    • https://cdn.shopify.com/s/files/1/0448/3465/2321/files/pukesewa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4309/files/sedazubumigekekowa.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054e5.bin
54d3ad39fdd75331d33b35b76dfdf70ee4c1ca38b14c5377cbe7a929973c275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E5 5368 bytes
font_01_sfnt_off00006718.bin
00519b685e6e52b366be31dd27dacb585f628a8613836e4f6391982f14a70f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 11116 bytes
font_02_sfnt_off00008cbb.bin
73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBB 16204 bytes

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