Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d6c204e6e46d5e…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 10:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d45f0a3e4711dc3a8d9d6400a01fb081 SHA-1: 809a8606cbf0ef8bf1556aa94c703615765e5ad4 SHA-256: 88d6c204e6e46d5e1b084da60c1e4aa876697cd8f46b3fc682eb0d69934edd4a
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the redirector. The ML classifier also strongly flagged this PDF as malicious.

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=push+pull+workout+4+day
    • https://static.usrfiles.com/ugd/b8c837_05f9fd05704643bcb590d79a516f4ca2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad9b255d5cf4ba5b5ac3a68487226bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c953eb87c884e2bba91d4f640366608.pdf
    • https://static.usrfiles.com/ugd/b8c837_5844bef1d722463685ebc3e8c95d2e04.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/wularinajogaz.pdf
    • https://cdn.shopify.com/s/files/1/0454/2844/1244/files/6719677971.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/multiple_meaning_words_context_clues_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/11432880198.pdf
    • https://static.usrfiles.com/ugd/b8c837_04040f7608d74a0495fb67801fd37b0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_aad08d6135b14cf6b8a216cea17e477a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf171a5ef2d744f5b6df74b9ed201237.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4c98390795049f68859e338efc7fd0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_16c0491b6fb24f8e8025b76238819755.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b3f0b65bf3644adac43ea71689f2f6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9c4ddd1fcf14e5c8f4eefad11cccdba.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_off00006a96.bin
c9a9855459f7023784b5ac1a636dcd2a522df2172f49952e3aff985002282383
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A96 5392 bytes
font_01_sfnt_off00007d00.bin
2725f462c23dfc57c67b3fe2a9d6627f183ffe1f9340231ef4e144bb0a6499dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D00 10108 bytes