Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b79eca69349189…

MALICIOUS

PDF

39.8 KB Created: 2020-08-12 00:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 286da241ae2be1d9839e6aa32f4b6197 SHA-1: e203d0db57691eb1477205bc946e1d61830f5397 SHA-256: 72b79eca69349189fef1957eb5cc4fb0a085fd9bf6dd419156e9889f2b95c0c7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though corrupted, contains text suggesting an academic lure ('Vascular anatomy of the brain pdf') which is likely intended to trick users into clicking the malicious links. The presence of many external PDF links, some pointing to benign Shopify domains and others to unknown domains, indicates a link farm or SEO poisoning tactic to distribute malicious content.

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=vascular+anatomy+of+the+brain+pdf
    • http://files.m3dance.com/uploads/1/3/1/8/131871698/26e2c9a10.pdf
    • http://kegitil.mariahelliott.com/uploads/1/3/2/6/132682663/povazunuwatoxulo.pdf
    • http://files.purchaseofmanhattan.com/uploads/1/3/1/1/131163693/rujepip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/wamitino.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/52333490913.pdf
    • https://cdn.shopify.com/s/files/1/0440/6696/3621/files/nujapejakafewulaxoguvumag.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/wabotiradekubodurijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/fiburunafiz.pdf
    • https://cdn.shopify.com/s/files/1/0454/7454/5816/files/mastering_blockchain_andreas.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/pijegepezinusuzapi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6773/4171/files/girupefojelidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/24845448892.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/73123313225.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/bekajigipafakaxokagomuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/nejireponazasimapekas.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/14423859329.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_off00005e03.bin
58e8d9bb813e8969558723d4490d6d34ea7826c1a5ee0a6661c91d937c1f7f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E03 5604 bytes
font_01_sfnt_off000070dc.bin
e545e0fc81d5c1a702c0884ea856eccd9f048d244d50304d6b17195e3bb360b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DC 9764 bytes

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