Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf2b484b0e9aa52…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 21:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c13c2b5407789d8ad48ae1887132bf9 SHA-1: 611fc0b484facc9741c357fcf040111f7e624201 SHA-256: adf2b484b0e9aa52c73989bf9ba59782bf777865fc41f966c2d324bf67acf83b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=fidelity+electronics+chess+challenge'. Additionally, it features a link farm with numerous external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly indicated maliciousness. The document body contains text related to a 'Fidelity electronics chess challenge' and the redirector URL, likely a lure.

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.cc/wix?keyword=fidelity+electronics+chess+challenge
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/zizekorudijoxoseposisavor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0429/8401/3977/files/songs_of_war_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/63344847278.pdf
    • https://cdn.shopify.com/s/files/1/0458/6271/5545/files/55448840106.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/39905549403.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/wegol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/21880272642.pdf
    • https://cdn.shopify.com/s/files/1/0428/7663/3247/files/sociolinguistics_by_hudson.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/fijarenuwenolego.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4369/files/kefisovurufiminijagiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/3475007324.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/admission_form_format_for_computer_institute.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/1968_chevy_caprice.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/82816043510.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_off00006468.bin
960040fa12f7f5b98f643bc642185f1d0d14210aeb037f23eba7df250eac37d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5256 bytes
font_01_sfnt_off00007642.bin
8c21c60100c228bdb3ebdf206860557e5315cfe288d2da47bd860ab2993d44a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 10252 bytes

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