Malicious PDF — malware analysis report

Static analysis result for SHA-256 e244b592a6306068…

MALICIOUS

PDF

122.7 KB Created: 2020-09-07 03:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d119269dace371352fedba30734770dd SHA-1: d64d87c18f1e3baaea62e995a1d274cb9adfc986 SHA-256: e244b592a6306068d70910ea5028275372aa53ffa5ed9d84bdb828efbb1700d6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=bootstrap+4+themes++free'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many hosted on Shopify and static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely for SEO manipulation or phishing.

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.cc/wix?keyword=bootstrap+4+themes++free
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39720928980.pdf
    • https://cdn.shopify.com/s/files/1/0437/9292/4821/files/uk_times_2_crossword_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/1706/6903/files/nixazisiwosoxib.pdf
    • https://cdn.shopify.com/s/files/1/0428/2915/2423/files/37556996173.pdf
    • https://cdn.shopify.com/s/files/1/0437/7840/8609/files/alcoro_traduzido_em_portugues.pdf
    • https://static.usrfiles.com/ugd/ad2ade_faad982c747b4afda5f4d53c3080f8a0.pdf
    • https://static.usrfiles.com/ugd/2ca09c_26327048c6854b80a0cd9b4dd09bc0d8.pdf
    • https://static.usrfiles.com/ugd/111c46_0b0c0cb45d2c4211900166b80a6be61a.pdf
    • https://static.usrfiles.com/ugd/4cfbbd_9eade4a9ea994eeea1bec31d22ae1f7a.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_2660bff2959f48c388703d3004a048b6.pdf
    • https://static.usrfiles.com/ugd/ef253e_2d0098ebb83042c7a4f7a934f1056cb4.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_94902732c79e485a9944d983f57f0d44.pdf
    • https://static.usrfiles.com/ugd/f3cb45_82ea5fb8005e4a52a2f75415678dfb36.pdf
    • https://static.usrfiles.com/ugd/628a76_f1177b7d58254500b78f4ce91353bcd1.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_off0001a7a1.bin
427bc92731efcaa9f605c193c9fab838415d65f2ff7d39c581fbed70eaa139e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A1 5248 bytes
font_01_sfnt_off0001b958.bin
74197207460bcef04258e377e63952e53d4d79df2dd230841163dfd4de757232
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B958 10608 bytes