Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edd31e36b4299ea…

MALICIOUS

PDF

34.6 KB Created: 2020-08-24 20:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128acd6cfed347016f6c165b26fae459 SHA-1: 15b3c5ee951f3f3898ba37abfc551e845619ffb7 SHA-256: 5edd31e36b4299ea82a4ff274e76d6c92e34c036f371ddd962a90fd1025e00be
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final malicious destination. The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The presence of a link to ttraff.ru, identified as malicious redirector infrastructure, further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious sites, potentially as part of a phishing or malware distribution campaign.

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=sad+girl+cartoon+images
    • http://delabij.andrewjamesinteriorsuk.co.uk/uploads/1/3/0/7/130739640/2263424.pdf
    • http://files.drjdechert.com/uploads/1/3/0/7/130738823/1ceb79.pdf
    • http://bivijile.msmorales-chemistry411.com/uploads/1/3/1/1/131163729/5008513.pdf
    • http://files.bluevista725.com/uploads/1/3/1/3/131379439/nagosinuzefowa-muxaromefaj-petilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8276/6743/files/89988541409.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/99102041194.pdf
    • https://cdn.shopify.com/s/files/1/0436/1404/4323/files/twitch_how_to_change_stream_title.pdf
    • https://cdn.shopify.com/s/files/1/0434/2523/5111/files/fafikiruwixafati.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/sql_format_amount_with_commas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/kuxevofiloj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/makhna_song_mp4_tinyjuke.pdf
    • https://cdn.shopify.com/s/files/1/0436/3019/8937/files/68410921400.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/72002540180.pdf
    • https://cdn.shopify.com/s/files/1/0433/4764/0469/files/55993969419.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/formal_synonym_for_assurance.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_off00004a69.bin
cd1768f32a2fe46ad76dc454328a204d0e61d3bb8789362d5aa7a332f44c0e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A69 5364 bytes
font_01_sfnt_off00005c77.bin
b0f8f054e4fd167febe4c78d9ec5183296fe822df4acc0567f111fb98ae82db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C77 9792 bytes

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