Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34e1df2f30cbd15…

MALICIOUS

PDF

49.6 KB Created: 2020-09-01 15:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd766dc4995106fcb3082852f9ca87d3 SHA-1: 4a922f2e174e0e85e46602c3fe0a666100e9e9f1 SHA-256: a34e1df2f30cbd15f0df7a44963718a4982508db53ef7acac9b4891e9e402a96
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One critical heuristic indicates a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and a URL that appears to be part of the link farm.

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.ru/wix?keyword=bodice+pattern+drafting+pdf
    • https://cdn.shopify.com/s/files/1/0429/3204/3943/files/pixasudixarox.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/niwoxafefojifaruxalu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/krusty_krab_theme_recorder_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/muzuzibibakusetewarekife.pdf
    • https://cdn.shopify.com/s/files/1/0439/9664/3486/files/lore_friendly_fallout_4_weapon_mods.pdf
    • https://static.usrfiles.com/ugd/79cb75_b31e25ab372146bc8d1c330d9a6f16fe.pdf
    • https://static.usrfiles.com/ugd/3f80ec_ee0d3e669c204f82bf07d36acc349ccf.pdf
    • https://static.usrfiles.com/ugd/e2b09b_9605bdd240194cf1b55558966e762623.pdf
    • https://static.usrfiles.com/ugd/b50c55_b34cd86253d24b10b9b80d4220de97dc.pdf
    • https://static.usrfiles.com/ugd/3826db_52ac38cb9077402a971670efe83c0e46.pdf
    • https://static.usrfiles.com/ugd/38bf1f_b7a86892dff14457a39fe8141e911b8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9767d14db0641d29797ede21fba75fc.pdf
    • https://static.usrfiles.com/ugd/97368a_ca9662043003455ba4b4e20a4347f041.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8f2906ae8a04caa8d393c15974df4cc.pdf
    • https://static.usrfiles.com/ugd/0aab01_56331934cc324405a85c1483d2cbe94c.pdf
    • https://static.usrfiles.com/ugd/b444d4_4c07fa3753454d31a19fbc2e06b680f3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008463.bin
82bcf12973bc4ec4a2d85a3c5c37cfcea28983b9249d671056a69272bafd8dfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x8463 5160 bytes
font_01_sfnt_off00009608.bin
450c882e0d8df4e9888e4c8de0e48574e83877cda1291c4e6e1fb9fcccb516e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9608 10472 bytes