Malicious PDF — malware analysis report

Static analysis result for SHA-256 6603cbc50b031302…

MALICIOUS

PDF

51.3 KB Created: 2020-08-09 05:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b7c244015c4daf0e03873ebac3c6722 SHA-1: e67ebf9a27a9a145031197a477e0e4728c59fbb6 SHA-256: 6603cbc50b0313029fec6bac9035c4a66ecc802e11b7494f1ebe0d4549be45f7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.com/pify?keyword=3+bedroom+house+plans+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to trick users into clicking it. 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.com/pify?keyword=3+bedroom+house+plans+pdf
    • http://sitelu.morethanatourist.net/uploads/1/3/0/7/130776485/d78204.pdf
    • http://files.omanroadshow.com/uploads/1/3/0/7/130776841/kasulojemuv.pdf
    • http://files.christfirstjamestown.org/uploads/1/3/1/4/131454984/ce190786019.pdf
    • http://files.confectionatelyyours.org/uploads/1/3/0/9/130969505/mapifovekakome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2949/4933/files/kozozasitira.pdf
    • https://cdn.shopify.com/s/files/1/0430/6278/8245/files/92589356748.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/mofegebobunizovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0605/files/dog_wash_n_go.pdf
    • https://cdn.shopify.com/s/files/1/0439/0617/1048/files/dnd_5e_melee_spell_attack.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/34206614177.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6257/files/cinderella_1950_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/54693508644.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/zoxopuzusekegoxusebu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1476/4190/files/97820444328.pdf
    • https://cdn.shopify.com/s/files/1/0429/4672/3996/files/classification_of_algae_by_lee.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/bukukatexaxunu.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_off000089cd.bin
9a276eb30c0e0832457b42a50a30f825a57bab2b6db944d4c67e36ffb35dde4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CD 5492 bytes
font_01_sfnt_off00009c3d.bin
9682dd81fb29ff10fd0a338671815d024757c69dbf33bd48dd25b6f0f396f632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3D 10576 bytes

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