Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ad728db3239928…

MALICIOUS

PDF

42.8 KB Created: 2020-08-24 22:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f7b1645a68c39a5f1595247973a08a SHA-1: 9e29bdb11807ce29f4cf1610521144949222bbc4 SHA-256: 45ad728db323992836ec6ab8bc1517338a25e09bd9803b4739cca7f0b7153766
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body also contains the same URL, suggesting it is intentionally placed to lure the user. The presence of numerous other links, many pointing to Shopify domains, further supports the idea of a link farm or redirection scheme. 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=anke+calligraphic+font+free
    • http://files.markallisonart.com/uploads/1/3/1/3/131380847/1da1cdad5f703e4.pdf
    • http://files.decor-boutique.co.uk/uploads/1/3/2/7/132712530/51c3439ba.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/87548975592.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/11031443170.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20659662050.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6117/files/90717329359.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/40291025509.pdf
    • https://cdn.shopify.com/s/files/1/0436/0388/6238/files/wugelakawexasijevinaxekez.pdf
    • https://cdn.shopify.com/s/files/1/0441/2178/4472/files/alphabetize_google_docs.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/dibabufititidaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/aircraft_design_a_conceptual_approach_third_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/77549273211.pdf
    • https://cdn.shopify.com/s/files/1/0447/0842/9977/files/hemiptera_families.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/a_m_letter_whatsapp_status.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/vumasivavulovaziz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005428.bin
eb69ed498fdbc0e72b1479809ccbba15fff699abafdd781be06b192460212178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5428 5152 bytes
font_01_sfnt_off000065a6.bin
c80828d4ff72f9fa077fd7837d8ba5e720b5f0d6cdf85a6a2ff0b0e85a3d470a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 10148 bytes
font_02_sfnt_off000088be.bin
8a62d4c1e0526ec2f69408e5c9dd9ddc9457dac5c1bef876ce11aff0c209df86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 16196 bytes

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