Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9e147573f344e7…

MALICIOUS

PDF

40.8 KB Created: 2020-08-08 12:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 203f2a6543f0f44000065755e148fa56 SHA-1: 6f31fffd641251e083d342290a4410908bfd62ae SHA-256: 3c9e147573f344e76af8187302c662c0ea5f3c55d5bef0c1a53eaf85b25fe2b5
154 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 designed to lead users to further malicious content. The document also hosts a large number of links to PDFs on Shopify, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious redirection attack.

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=antonyms%20worksheets%20grade%203
    • http://files.pergusconsulting.com/uploads/1/3/2/7/132712490/jozotiwakulibu-kotozalogif-fiwiv-vokazuvoze.pdf
    • http://files.thecarolann.com/uploads/1/3/1/3/131383942/7270159.pdf
    • http://files.embassyrow-properties.com/uploads/1/3/0/7/130739450/6889841.pdf
    • http://files.accidental-blogger.com/uploads/1/3/0/7/130739814/7833137.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2667/files/chuyn_file_sang_hnh_nh.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/bopuzaradojosagasazufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/nopuvekirinalonadupom.pdf
    • https://cdn.shopify.com/s/files/1/0433/6448/3240/files/kumibujanumumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6094/4296/files/sonic_x_theme_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/5104/8357/files/porakosavovaxuvaru.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/83380768763.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/rorenufek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/jspdf_html_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/nevokajubilasajatafexixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/47882366470.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/pawokofaxufarazebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/james_stewart_early_transcendentals_7e.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_off00005ff0.bin
94c090aff32f891fd9a661c9ab936528fb06cddeaf313f3f5d639fbbca9c2878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 5616 bytes
font_01_sfnt_off00007303.bin
4d5f8960af2100feeeb4f096229610f6db8016c73d7660f13994ebfc18d5b42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7303 10316 bytes

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