Malicious PDF — malware analysis report

Static analysis result for SHA-256 459c56c241e4ced1…

MALICIOUS

PDF

34.6 KB Created: 2020-08-03 23:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304baa399c548855cb763136f7851ac4 SHA-1: 7184b7e526d9cb91be4466a791067593e52729db SHA-256: 459c56c241e4ced1e65df094341ffa720f82608b1b40636d185e70f0c1af8614
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify-hosted PDFs, suggesting a link farm for SEO manipulation or traffic redirection. One critical heuristic identified a link to a known malicious redirector infrastructure at `ttraff.com`. The document body, though heavily obfuscated, contains text related to 'Baumuller servo drive manual' and the PDF creation tool 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=baumuller%20servo%20drive%20manual
    • http://files.howardpatten.com/uploads/1/3/2/6/132695663/dobokuzitib_lusemizewen_tufexu.pdf
    • http://files.javaromaroasters.com/uploads/1/3/1/3/131380728/viwexi_maganub_zasud_wexepopo.pdf
    • http://files.timdewittphotography.com/uploads/1/3/0/8/130874422/6912932.pdf
    • http://files.alexjtunney.com/uploads/1/3/1/3/131382955/329112.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/69748411671.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/ditebonexavaxegekoza.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/linurij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/42568441472.pdf
    • https://cdn.shopify.com/s/files/1/0438/8664/1304/files/kezulefapigajagupinodefo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5808/files/fasotenigozipubafeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/rajimefogedivobafowuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86477918810.pdf
    • https://cdn.shopify.com/s/files/1/0436/4802/4741/files/fobinisuxorisikemubile.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/bhagavad_gita_with_meaning_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/fafegizuge.pdf
    • https://cdn.shopify.com/s/files/1/0437/6982/3383/files/lupobajuvojikoduma.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_off00004e22.bin
440e20e0bbf5d078a51c8614520b533c689596d1f77fffc8b3b5b79023770971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E22 5080 bytes
font_01_sfnt_off00005f4f.bin
a8ae6b7a09cb8e522ebc6f2bb7a5904ec09bc1eb9ce83ca41249daffd922e884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4F 8872 bytes

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