Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b0878f09242f14…

MALICIOUS

PDF

41.2 KB Created: 2020-08-21 00:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325dc81df9ee39391de4e084d359f0b8 SHA-1: 0bf17ba84646ed82806ea5c4c12d4d3afabef438 SHA-256: 83b0878f09242f143cb22182442547c5b50444f8e85b24217d4daa7ddc9d29e4
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to direct users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an intent to exploit users through redirection, likely as part of a phishing or scam campaign.

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=compass+learning+algebra+1+answers
    • http://mutod.ballisticstrength.ca/uploads/1/3/0/7/130775823/f9077558ed5129.pdf
    • http://wopube.dslvnjny.com/uploads/1/3/2/6/132696056/18b0ff5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/31046643323.pdf
    • https://cdn.shopify.com/s/files/1/0439/0299/2536/files/bitebir.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/52005742845.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/44185217589.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/nsfas_application_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/54559917792.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/41758012758.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/vajoxamujozagotedemefito.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_off000062be.bin
b725166c6e3e32abadff1b0214a15d6fffb9ef8607186fe79f05d5250cd3ba2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BE 5328 bytes
font_01_sfnt_off000074d7.bin
e0b6f6fb9a47770b58a3af8be8466e09bed5cd6328a0df75768fa4cc5c3b8f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D7 10280 bytes

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