Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcd0c8b47d3b6e5…

MALICIOUS

PDF

43.1 KB Created: 2020-07-27 09:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85d30fd12157c8af3a5694c0d6092011 SHA-1: 8a9b42cdc0693a94b8885c850b9e2d3b22142844 SHA-256: 5dcd0c8b47d3b6e5399eb38e204e34039589550b6a63ba33a7ea68c7a745fa85
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to direct users to harmful content. It also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely for phishing or malware delivery.

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=adele+hello+piano+sheet+easy
    • http://files.edonfitness.com/uploads/1/3/1/4/131452735/5204290.pdf
    • http://files.threesheetsyachtrock.com/uploads/1/3/1/4/131453048/79943380.pdf
    • http://files.brettstotalstumpgrinding.com/uploads/1/3/1/0/131070246/8d982602.pdf
    • http://files.twistssponge.com/uploads/1/3/1/4/131453333/jufula.pdf
    • http://files.dianakemp.com.au/uploads/1/3/1/8/131856703/8545444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/resij.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/nafizigozunulunevem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wexidemunuviviradepinitim.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/lupiwotugewiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/2493/3283/files/deluzuxulevexurudubot.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/77790347237.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/rejenitepilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/34057029671.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/39499292610.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2123/files/25486054687.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/welabonik.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/66705232040.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_off00005ce6.bin
4e60717d12cc0cbd7540f7f0c5ae7800d8417bda37ceb7ca18948a5e7cda0cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE6 4828 bytes
font_01_sfnt_off00006d45.bin
d19af741c352279286d9ff4ffb04e83102615c1ec638c18558cf4832f03a9ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D45 15112 bytes

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