Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a26059bcbb91103…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 01:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68335caa53e77336539e9fd166b044ab SHA-1: f4daf1cd1ab3537aa8f5acdfa7feba2f272291fb SHA-256: 0a26059bcbb91103c9f69c2e2cfa9d3296d6e2b146cd3973fb9260f53c9931bd
154 Risk Score

Malware Insights

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

The PDF contains a link farm of multiple PDF documents, with one link pointing to a known malicious redirector. The document body and embedded URLs suggest an attempt to drive traffic to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly indicated maliciousness, supporting this assessment.

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.ru/wix?keyword=the+tools+phil+stutz+pdf+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e2f7e1_5965df035bc94e07b8d86a157af58283.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ac9f9b88e3c48abafbd446574e31abb.pdf
    • https://static.usrfiles.com/ugd/eaf48f_f767dc899459425fbba812986b6f4791.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/90041017569.pdf
    • https://static.usrfiles.com/ugd/8b9728_2b64b3ec7f4c4c9e9934198eaee3a4d2.pdf
    • https://static.usrfiles.com/ugd/ea2f88_d476d1905bfa46419ea3c94ad0533ce3.pdf
    • https://static.usrfiles.com/ugd/b8c837_03469f8f1a1c4133900d943862dac300.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/28428803420.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/badinerie_piccolo_trumpet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0627/files/pezubek.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_off00005d59.bin
9688d457bb434b32c1da7f9707db28480bee4e94493e04bf5ee963b48e3bdbc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D59 5124 bytes
font_01_sfnt_off00006ee4.bin
25a8ee685f311f9416d325ccb94a262074f89f0b9749e2153efa284de55e0d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 10152 bytes

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