Malicious PDF — malware analysis report

Static analysis result for SHA-256 2808944ac1c0356b…

MALICIOUS

PDF

44.8 KB Created: 2020-08-10 15:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f605045c649af9a14e8b72cdd3cc782 SHA-1: 348885d239dfa7c9fa4ac3f1c71b3c63c42a1aee SHA-256: 2808944ac1c0356b6135d4b3950af88d44267c9b0d5d100b4aeda607b93e2c9f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely serve as lures or redirect to malicious payloads.

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=robotica+avanzada+pdf
    • http://files.circular-canary.com/uploads/1/3/0/7/130776578/tovoxop.pdf
    • http://files.elianed.com/uploads/1/3/1/1/131164236/d701cdcb03d10a.pdf
    • http://zitogotow.walcokip.com/uploads/1/3/0/8/130814297/2624889.pdf
    • http://files.halloweeninthehills.com/uploads/1/3/0/7/130740420/jebizepusala_meragarafuguzu_vomunemixit_divivalijagatob.pdf
    • http://namonewa.doyouhaveitinblack.com/uploads/1/3/0/7/130776407/402db134b.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2277/files/zeriwaneb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0255/1716/files/51595880363.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/biochemistry_and_molecular_biology_of_plants_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/90469320788.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/sexidixi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/google_dork_website_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/7802/5370/files/59926670565.pdf
    • https://cdn.shopify.com/s/files/1/0439/7573/7502/files/dieta_cetogenica_vegana.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/5479834899.pdf
    • https://cdn.shopify.com/s/files/1/0428/9950/5311/files/xededuleboreluwaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9726/9159/files/hida_brownian_motion.pdf
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/lolubidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/69288586643.pdf
    • https://cdn.shopify.com/s/files/1/0429/5249/1159/files/539588235.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071cc.bin
ee6bfd2b8f13c914211fede7fd9130ee5383e84842ef7a79376bf88a42452e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CC 5100 bytes
font_01_sfnt_off00008349.bin
2b83f8aecbd3abac39e2197a5c13c0cf12e5a1b4127b15fc1985139af972cfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8349 10744 bytes

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