Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dbd456f96e5036…

MALICIOUS

PDF

36.2 KB Created: 2020-08-29 18:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ae23dc422306fb453f991640da8e25 SHA-1: 6b992f872e56c650cd543ffda483cdeea8af6550 SHA-256: 15dbd456f96e503608309dad0542678373a650c6d87e9d8913bdae40e106e04f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a deceptive title and numerous embedded links, many of which point to external PDF files, suggesting a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=serment+-+contract+with+a+devil'. The ML classifier also strongly indicated maliciousness. The document's primary purpose appears to be directing users to malicious or spam-related content.

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=serment+-+contract+with+a+devil
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_96fd505f73ce4c528ffd0cc23ef824c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6aae4917859e4932aac2d8b100caaea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_58663ce709c448bca39a3026dc301f13.pdf
    • https://static.usrfiles.com/ugd/b5472a_1e7e15e66e824eccbb8b504e16648737.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f64df21bf014d7ab3f38b55f712d9d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_fded61b4a0f74705b95d29c1c5064f73.pdf
    • https://static.usrfiles.com/ugd/3b0c81_69420c9b84f247439658da7f8cbe9861.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9843def85c248e6a25c0dfb447b3b62.pdf
    • https://static.usrfiles.com/ugd/8c2aca_ee713a40f8204906b1f140c774ecc9ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad51b6408ef4ed9af97f2a90451d3d1.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/engineering_mechanics_dynamics_meriam.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/lusimovemapabi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f0d.bin
b940e49bd184b297addb44380c26b4f48efdd7e7bf7c8239dc8a4e910873a225
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F0D 5288 bytes
font_01_sfnt_off000060ec.bin
c0b02737af0f18468cfaf896b678da25adcaff8bd60910c6c38ecbeddaa30ecf
pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 10384 bytes