Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7e57a5f9360f69…

MALICIOUS

PDF

50.6 KB Created: 2020-08-03 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47a78808a98aea27da42e2a2dc29a66f SHA-1: 103a47a5d980fae45eb06d948a035f015d1d6775 SHA-256: 0b7e57a5f9360f69408343d0ebce0ba2f98f542b2d1cdbd0d252204a64383837
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to a 'manual fuel tank selector valve' and references the wkhtmltopdf tool, suggesting a lure to external 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.ru/pify?keyword=manual+fuel+tank+selector+valve
    • http://files.shueyvilleia.com/uploads/1/3/1/6/131637953/doxukipemasij.pdf
    • http://dokud.apianalosangeles.com/uploads/1/3/1/4/131437736/8398962.pdf
    • http://files.rosaliesilliman.com/uploads/1/3/2/7/132740804/kovenexilimesitiko.pdf
    • http://files.transportes-salazar.com/uploads/1/3/1/3/131383318/ce0bb1887d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/53369188506.pdf
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/yennai_arindhaal_movie.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/swords_and_sandals_3.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/95479139587.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/50225009068.pdf
    • https://cdn.shopify.com/s/files/1/0432/0077/4307/files/macbook_serial_number_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0436/5330/0377/files/16208184327.pdf
    • https://cdn.shopify.com/s/files/1/0433/8611/0110/files/rinawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2338/4219/files/womasilevaxanezexeran.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/77249186903.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/34671904807.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007416.bin
522f385028ad65ba1c08f3e2a8f9f429bf0fac7ed8f284b3f7ae8cfd4d48b959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 4840 bytes
font_01_sfnt_off000084a5.bin
4cdb3993f6d2f19face3da3729abc5d7579fe5c965a40043eabf2d3571dda42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A5 12952 bytes
font_02_sfnt_off0000af60.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 4324 bytes

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