Malicious PDF — malware analysis report

Static analysis result for SHA-256 751bcf7c14a5d0fa…

MALICIOUS

PDF

50.5 KB Created: 2020-08-02 19:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f46fb94250b5b8871de5dd69c7f1f5 SHA-1: aaa42bd77daeb4492ec13c348f0b6e164a7ed70c SHA-256: 751bcf7c14a5d0fa6c1457d477a46c4b89d98949b1fe7c8b9f34a4497d159872
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 a redirector service known to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malware through a link farm. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious sites.

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/pify?keyword=operi+mini+7
    • http://files.stoneycreektamaskan.com/uploads/1/3/0/7/130775292/150bb18c782300b.pdf
    • http://files.satellitecitybmxclub.com/uploads/1/3/0/7/130739831/zomeruwi.pdf
    • http://files.thejharrisdesigns.com/uploads/1/3/1/1/131163635/dekukovuxideda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8737/1171/files/88668291408.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/64708771872.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/93509668104.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/pisanozabinaxokola.pdf
    • https://cdn.shopify.com/s/files/1/0433/7382/2102/files/lejujavimexumuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/gozozewarinavanibemo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7099/7151/files/fokirolalerinigujunit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1819/files/19324635623.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/72422742271.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/gifov.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/2545168625.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/36137354912.pdf
    • https://cdn.shopify.com/s/files/1/0433/0261/7252/files/badumer.pdf
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/wow_classic_mystery_meat_recipe.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_off00008752.bin
ee82828eb7145154d549a4b55f31b582f9045c31c381391bd5ae41fc09257067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8752 4652 bytes
font_01_sfnt_off00009715.bin
23129e71a0caeab980057d8228a8c9a21e01e79726c381aebfc2f82e40e1afd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9715 11636 bytes

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