Malicious PDF — malware analysis report

Static analysis result for SHA-256 3096c28e76f8adf7…

MALICIOUS

PDF

51.2 KB Created: 2020-09-11 01:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2023056b43b9fd816bf27f1b4f8213f5 SHA-1: cd7c6735eabc0c5316bec2ac52ccbcdac942eed0 SHA-256: 3096c28e76f8adf77e174cde11b5212ef16dfe0b4107e992a2b8ec376a5f53ae
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains this URL and other embedded URLs that appear to be part of a link farm. The primary malicious URL is used to redirect users, likely to a phishing or malware distribution site.

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=thanksgiving+day+worksheets+middle+school
    • http://files.christophersusak.com/uploads/1/3/1/8/131872087/zudawudul.pdf
    • http://files.annerosenberg.com/uploads/1/3/1/0/131070912/ee5687a3c18b.pdf
    • http://madoxaso.friendsofdurham.com/uploads/1/3/2/8/132814930/jekatixe.pdf
    • https://static.usrfiles.com/ugd/ba3095_7f8cd2364a144b7fa5da66145439ac92.pdf
    • https://static.usrfiles.com/ugd/41f880_be2915bdf30540e2a915a80702ddf457.pdf
    • https://static.usrfiles.com/ugd/2813e2_c997514fb19a47f7982a01fdaaeefb94.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_2d1cf00057cc4582a20fda720f2ddea4.pdf
    • https://static.usrfiles.com/ugd/3bca44_143eeaea2e8e407d8cada07091199255.pdf
    • https://static.usrfiles.com/ugd/b8c837_157440d2edae43d6b7bdffdd7c5d561d.pdf
    • https://static.usrfiles.com/ugd/16879a_ccd196ef54c14519ba12cae4992b7928.pdf
    • https://static.usrfiles.com/ugd/451a43_96641947a90642ac972fcfa6b0b8c7e6.pdf
    • https://static.usrfiles.com/ugd/ed64d2_e743345215014b3fa0e6c463b797c20c.pdf
    • https://static.usrfiles.com/ugd/98857b_006dc2b4385e4047b943ea5f59df15c9.pdf
    • https://static.usrfiles.com/ugd/b371d9_1eaca72ed2474873a0ef6ec7b19791d8.pdf
    • https://static.usrfiles.com/ugd/96bf9d_35e81b577f9e400ba877d2ed5abc35b9.pdf
    • https://static.usrfiles.com/ugd/7d21c0_731eee6992af404c99887a972edfe64b.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c52.bin
85955251b3838535ceed5de6fc8f7419160862680b7c3fc2b7641797e1c2ebae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C52 5408 bytes
font_01_sfnt_off00008e96.bin
a067e05085e2f94c177b1c336d49608f01ef90ed4b43b745e53f81bbaba23195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E96 10120 bytes
font_02_sfnt_off0000b130.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB130 4324 bytes

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