Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa50c1d305c8948…

MALICIOUS

PDF

44.2 KB Created: 2020-09-01 01:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78a1cf4b84d00d065577961d901a11ea SHA-1: 6e501d5a217c497e3258230ee97daf205c10a99e SHA-256: 5fa50c1d305c8948393988e0dbb35b6baa4af5415e7163605c3f471a6ed71575
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a movie song download, which redirects to a known malicious URL. This indicates a phishing or redirection attack aimed at users searching for specific content. The presence of numerous other PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO poisoning tactic to increase the visibility of the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/pify?keyword=honey+bee+malayalam+movie+songs++kuttyweb
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6920/1832/files/zanedapisamo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/96267012774.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/equation_of_a_circle_worksheet_gcse.pdf
    • https://cdn.shopify.com/s/files/1/0428/6627/8556/files/17458800129.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/77817266683.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/75491028395.pdf
    • https://cdn.shopify.com/s/files/1/0435/9772/5864/files/sesowafeximo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3901/files/86959314146.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/burnt_offerings_robert_marasco.pdf
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/66452789325.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/levalimusipazosuzus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekerumukin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6725/2629/files/75658715138.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/71443189032.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/61626327956.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_off00006dee.bin
d3787799b995f7fe35ef82ffd0b5fd9410cb6958f07221ab68f96f0e0e396202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEE 5328 bytes
font_01_sfnt_off0000801b.bin
d9f820aead2f6f5bfb49a780358971dc7ef221c4fb43fefeaa1144e7ba72b5f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801B 10444 bytes

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