Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5e733fddbef818…

MALICIOUS

PDF

116.2 KB Created: 2020-07-24 15:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37c0a90fc8c5d7511fa85b87ce6d3cd9 SHA-1: 38732f517a497b9986a4025cb4f6f95468de0eb9 SHA-256: 1e5e733fddbef81854ecccecea553764811e31c40c5a4d336aa844b249bb35f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=thoracic+aneurysm+repair+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains fragments suggesting a topic related to medical guidelines, likely a lure.

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=thoracic+aneurysm+repair+guidelines
    • http://files.rivervalleyrevenge.com/uploads/1/3/2/6/132680827/6dbcdc75c.pdf
    • http://files.iwanttobeanengineer.com.au/uploads/1/3/2/6/132681026/3677265.pdf
    • http://files.adansilveriomurillo.com/uploads/1/3/0/7/130739850/2372283.pdf
    • http://files.smjcakes.com/uploads/1/3/1/3/131381901/8758841.pdf
    • http://files.aloenottingham.com/uploads/1/3/0/8/130813606/212d8a6.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/76742970792.pdf
    • https://cdn.shopify.com/s/files/1/0433/8221/0725/files/gamatujitoloporafufab.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/valupuvavulevakasotase.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/15847125258.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/13998653498.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/lanewujuzotupodudimegozo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/guniwilur.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/71528047878.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/mapadu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/mekuzufije.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/tapomotimiwusulusup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/pekekegedavaduturosetekex.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/218993483.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001881b.bin
2cbebd241daa47f84cfa0aa415a286adc6fbfbf350dc924a38999da1d978934b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1881B 5340 bytes
font_01_sfnt_off00019a12.bin
f5a51f62d1d89449903424f1d02ecababdc91a8f002f6dce9deb264bf5d310d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A12 12820 bytes

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