Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fb21f5753dcacc…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 04:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a67a7f80e2a19b7d9a06812e2c3f64 SHA-1: c5519e56d31c8e1eb737a14d291730e9dd06c6c4 SHA-256: 74fb21f5753dcacc925c4fdda1a82c6d4a60291c962c13e36e2117b03f88750e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for malicious redirector links, specifically pointing to ttraff.com. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents, likely to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the document body, though heavily obfuscated, contains the suspicious URL.

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=lynn+nottage+sweat
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/909b15_bb2ea4387206478c914093012d3516fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcd2d19f2e0347388e6efd2680f7a612.pdf
    • https://static.usrfiles.com/ugd/b8c837_58416f673d194866acf20d68800139f1.pdf
    • https://cdn.shopify.com/s/files/1/0428/5408/8871/files/after_2_anna_todd_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/dukemadamikibifaxakarex.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/lagatim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/borland_delphi_6_developer_s_guide.pdf
    • https://static.usrfiles.com/ugd/6846fe_12f05b25394f45378e1c9080b7640ce1.pdf
    • https://static.usrfiles.com/ugd/1f6d71_2dece99e785646f69199cd81d7b8fefd.pdf
    • https://static.usrfiles.com/ugd/9e41f0_656348b38cd144b591d2d20bbcc3e788.pdf
    • https://static.usrfiles.com/ugd/b8c837_762b6dbac868490a9eb1d82683b1ecc1.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b0.bin
1b97ce3f557ef38498cf54bac3de4a3fd33a0c908b4713540653f02de5e4585d
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B0 4860 bytes
font_01_sfnt_off0000746c.bin
a99ae70b07a5a3550c26f8497a34784bf5cd3458bfdb3a438f1255028ae47e40
pdf-font-stream PDF embedded font (sfnt) at offset 0x746C 10120 bytes
font_02_sfnt_off00009727.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67
pdf-font-stream PDF embedded font (sfnt) at offset 0x9727 16092 bytes