Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ae690d921e8dc1…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 01:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84b61db26ea3bc2d9b248f9412aa4f0 SHA-1: d0a8722b104b783cbe4d9db62fa33ec408c529ef SHA-256: b8ae690d921e8dc15ed2a0cfedab9aa4004a34166304c01c9ffb78e6c362754d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a product review. The PDF also contains a large number of links to external PDFs, likely for SEO manipulation to improve the ranking of the malicious redirector. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector is the malicious link.

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=delonghi+dragon+2+review
    • https://static.usrfiles.com/ugd/b8c837_6b61e6cd388a42f48e0b2d3385a06b1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8561ea4ef212406ea4f6aa3007d15b07.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb538a5856ec400bbad7fdf3f6db4f36.pdf
    • https://static.usrfiles.com/ugd/b8c837_05f0478cb90445b1bd23fb2084d983f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a9f8d3306244c11988bdb7009189749.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b43c685aaea403bb1a112fa16eaf3c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7bc3773947c4fe99aed41d6f2988ff0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab4fb75bd07401dbd7e7bf39f9660f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_92285239dda64af3bd69be43a5aa0015.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9bea05a4a694db188dccb50f09b1215.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3c088c13cb04a428c58dfef8b604f5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_40ed16edf3574c13924473f8c8f1ea30.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dcfd9fb9f47429f95d6340a8be0a926.pdf
    • https://static.usrfiles.com/ugd/b8c837_a846efa9854d47ff9a344078faf818f2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ef2.bin
cd9979a9c7652bc0be7edb873755da3068f4450c3719d39972f52ca8094426c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF2 4900 bytes
font_01_sfnt_off00006f95.bin
78b32e43b896e11c329d3135337b5916a4f24800a7a211d7f8e1f48795318b93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F95 10012 bytes
font_02_sfnt_off000091b5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x91B5 4324 bytes