Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91c0f51f2bee9da…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 07:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 148e21bb97a0ba1329a8715b46443cc0 SHA-1: 4524ae4427050c2891165bea542c8c6287f8e3a7 SHA-256: c91c0f51f2bee9da6647ddfe301cae668c5cb0b3eedc6bfff85182f208e618bb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=difference+between+intranet+and+internet+pdf, is identified as a malicious redirector. The document body itself is heavily obfuscated but contains references to the same topic as the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier 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.cc/pify?keyword=difference+between+intranet+and+internet+pdf
    • http://tamawa.christianinconnect.com/uploads/1/3/0/7/130738714/fixovopobinurixu.pdf
    • http://gapakeben.littleatelieryc.com/uploads/1/3/1/4/131406082/bekilur.pdf
    • http://files.christiangreenlmt.com/uploads/1/3/1/6/131636834/golufebuvila.pdf
    • http://turopor.sheffieldmills.org/uploads/1/3/2/6/132680813/nuweko-jedebebutomewu-kawopovusero-jedipisoluvak.pdf
    • http://files.hesteryoga.co.uk/uploads/1/3/0/9/130969895/d72085c72cf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67142307476.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/24860561888.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/migapawidogos.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/famosanirolikoles.pdf
    • https://cdn.shopify.com/s/files/1/0433/6212/3941/files/lubopumawavatavas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/zezoroxuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9424/files/busumimew.pdf
    • https://cdn.shopify.com/s/files/1/0431/5486/6333/files/615046585.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0437/3889/0394/files/caterpillar_3126_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tobilefoseparavako.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/powifol.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/42984075986.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_off00006ac8.bin
a6c36cb1e0a3adebaeefcd7509a23b0b1e7ebb22277885221601d6d364890e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC8 4848 bytes
font_01_sfnt_off00007b59.bin
2b4882038ca8e11f8ebfbb9c39a7eda4d86a2ab931abf21cdc6d3285eaea11bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B59 9920 bytes
font_02_sfnt_off00009d59.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D59 4324 bytes

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