Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5876c276dd5605…

MALICIOUS

PDF

42.1 KB Created: 2020-08-15 08:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d36c997a0f50bce3f88d24b48637b20 SHA-1: f8ea38f94e564371e3de5c0e6d0696fa70175bfc SHA-256: 5e5876c276dd56054312c3b57798609329275568c9ede9733ed3f5404df770c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=butterfly+flower+images', indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=butterfly+flower+images
    • http://mokumoku.willowsportswear.com/uploads/1/3/0/7/130775934/e7963927.pdf
    • http://netefod.flattopprimitivebaptistchurch.org/uploads/1/3/0/8/130874308/futeko.pdf
    • http://files.brokenlandbook.com/uploads/1/3/2/6/132680813/50090bc6989897.pdf
    • http://files.tanyafazal.com/uploads/1/3/0/9/130969358/7889757.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/kazuviwalaguzilelureruzu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mejiwevabefi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2332/files/summary_of_lower_limb_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0446/9784/5913/files/amleto_download_ita.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dresser_rand_steam_turbine.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/5_o_clock_in_the_morning_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/3294/3519/files/castle_made_of_sand_song.pdf
    • https://cdn.shopify.com/s/files/1/0439/3867/6894/files/pdf_to_word_document_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/88652408097.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/25312044973.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/sipugusipazireb.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/76386678728.pdf
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/lemoramevofejogev.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_off0000661d.bin
8a8fddbf0061bb8150480a92571d3850adce923da3b14e1f25a18ae232a77fcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661D 5328 bytes
font_01_sfnt_off00007844.bin
368e8520619320bee33ba2b360d4b67b539859be82a7359c40f947909f0d951d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7844 10288 bytes

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