Malicious PDF — malware analysis report

Static analysis result for SHA-256 d684e1cae136d44d…

MALICIOUS

PDF

41.2 KB Created: 2020-09-04 06:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcdb81bf3fd45e4d0da2d8e66ebea841 SHA-1: e91ad2ecf7ad5c803757325889fa265376c21096 SHA-256: d684e1cae136d44d77ac8ddd5072885f1d09edbed551e0b4d3be708b2cd15490
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.club/wix?keyword=guided+reading+levels+for+3rd+grade`. This link is embedded within the document body, which also contains other benign-looking URLs. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring the user to a malicious site via a seemingly innocuous document.

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.club/wix?keyword=guided+reading+levels+for+3rd+grade
    • https://static.usrfiles.com/ugd/ef7486_338092e55fba4793b7d3185604ac58fa.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_622109e3e2a3493894729a9c8ff2dd80.pdf
    • https://static.usrfiles.com/ugd/76aeb6_ad04e42317b14d8dae35bae6f16e4873.pdf
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/adare_pujaniyai_shihan_lanthra_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zinigezumapafukutogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/buderus_logamatic_rc310_bedienungsanleitung.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/medodamopagoxokapavawajab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84770620138.pdf
    • https://static.usrfiles.com/ugd/5bb01c_be20857d2dec41898d195d223ffa8b63.pdf
    • https://static.usrfiles.com/ugd/c57cae_55078cc3c9904488a5fc3cb0318b7c67.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a4506a47f6047d0a94f367898079fad.pdf
    • https://static.usrfiles.com/ugd/5af86b_4bec53f292824e0cbeb303fac6cdf6ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_aafe7d4a9c8c49fa97a38022815f22f7.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_5bd93acf367145f58a5619fb061c05a4.pdf
    • https://static.usrfiles.com/ugd/850f07_e061fc81117e499b96c69bc7c09a1e50.pdf
    • https://static.usrfiles.com/ugd/9b33c5_ecdc2dceccfb4e02957682a0c772f981.pdf
    • https://static.usrfiles.com/ugd/8b49c6_33777284288f415cb4ff5e8ca6085f6d.pdf
    • https://static.usrfiles.com/ugd/4d935e_3f988ead56db4d8bb58aaf88982e863e.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/
    • https://static.usrfiles.com/ugd/4d935e_3f988ead56db4d8bb58aaf88982e863e.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006174.bin
76db521051bda8b4e3071968693cc1da0fb3ee064ba4cc1331648456e55c8b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 5328 bytes
font_01_sfnt_off000073b2.bin
57c5f32b6857bcc2f2325496ce157deea4950b1e288a0e48585973987533d7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 10552 bytes

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