Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff085cc6600a39c5…

MALICIOUS

PDF

43.7 KB Created: 2020-08-31 09:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5511ff52b1a6a02505bf0430f73c097 SHA-1: 41e8414c8b1b7af78cd098566d5b4527af6a73c9 SHA-256: ff085cc6600a39c5aa31eb6867d8bdfb4fb7565cb4c3bf795c3a5e8aa7ef0461
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=the+cross+and+the+switchblade+sparknotes', suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness.

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=the+cross+and+the+switchblade+sparknotes
    • https://static.usrfiles.com/ugd/b8c837_b9842a2897bf4bdc9bb74fe7f8ce7dda.pdf
    • https://static.usrfiles.com/ugd/cf14a4_c14897df6389428a90aacdf377f2df8a.pdf
    • https://static.usrfiles.com/ugd/c20ea7_ba4fa68ab97a4b47a2c4a4821cc9c4ca.pdf
    • https://static.usrfiles.com/ugd/ea2f88_0d3e6f5416de4979830d681e23a58788.pdf
    • https://static.usrfiles.com/ugd/0c41e7_d372bcc956e74d6e87ec239367cb18a5.pdf
    • https://static.usrfiles.com/ugd/37428b_40e9432a3869481ca713aebd46b1b170.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae49135642142e999509e05cca976d6.pdf
    • https://static.usrfiles.com/ugd/93c935_591cea34ab214e609b42421d741fdc3f.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/como_aprende_el_cerebro_libro.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0946/files/arte_contemporaneo_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/dead_poets_society_movie_720p.pdf
    • https://cdn.shopify.com/s/files/1/0432/1945/2072/files/basic_synonyms_and_antonyms_list.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_off00005f78.bin
53927a8f73d9a8be5928623836925d2fd3584d0c156feb0b948d6e4da63dbc09
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F78 5192 bytes
font_01_sfnt_off00007117.bin
5e600d46245f4b5bf59137ead60d5251a578610883d4465c895a1fce04159f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7117 10188 bytes
font_02_sfnt_off000093e7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x93E7 4324 bytes