Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5b517e37c5b609…

MALICIOUS

PDF

40.7 KB Created: 2020-08-07 14:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 424299715cd3daaa28d6a3b303d70068 SHA-1: e26b40461d0bb9514106c2295a6b73cc7fc3a3b6 SHA-256: 7b5b517e37c5b609b95811032cf67168e8119b47acc21e87c339884cd5193e2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, masquerading as a jewellery catalogue, to a redirector URL. This behaviour is indicative of a link farm or phishing lure designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=gold+wedding+jewellery+designs+catalogue+pdf
    • http://files.focused-fitness.com/uploads/1/3/1/3/131398140/5c3e1275b4f.pdf
    • http://rawetebeb.sabahhomestaykualapenyu.com/uploads/1/3/0/8/130874422/wewetizili-ketomamo-litaruvud-susogizum.pdf
    • http://xomobopel.genevieve-wojcik.com/uploads/1/3/0/8/130813612/sodevof_bedufo.pdf
    • http://nekosifol.lfpsafestreets.com/uploads/1/3/1/8/131856725/acc3bb7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/peasant_s_quest_patreon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/xevarutuwes.pdf
    • https://cdn.shopify.com/s/files/1/0429/7919/7081/files/88236625265.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/christianity_and_autosuggestion.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/jalofoxotiwaxuminuwab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/18310821654.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/52680311080.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/88560927081.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mipubafuminidumef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/64964422899.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/bioprocess_engineering_shuler_solution_manual.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_off0000610b.bin
e865345f09da48e8b8aa2745bf2903e89c8a1d21bb77e122076711cced47bea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610B 5624 bytes
font_01_sfnt_off0000745d.bin
b119349d95cd510141134f4a2ddb35a23470a80e7eac3dd2f0c5af13d6cfee52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745D 9776 bytes

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