Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a70f073d546731…

MALICIOUS

PDF

50.0 KB Created: 2020-08-16 18:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e708daf41090a87d9f3946c0fcd85b9b SHA-1: d601e0bc944f5360ee8bf3df31dc24799e62dfe0 SHA-256: c8a70f073d5467319c76b89e624ddc041c04b5170b8882c808596a0e40a2679a
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to 'after effect transition template free' and the malicious URL. This suggests the PDF is designed to trick users into downloading potentially malicious content by disguising it as a free template.

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=after+effect+transition+template+free
    • http://files.basstabernaclecme.com/uploads/1/3/1/3/131380158/vunigutenenemaj_juvuwazesenupes_fenulaxirupida_lexavem.pdf
    • http://files.tarragnaegel.com/uploads/1/3/2/6/132695543/755821.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/52955053131.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/vuzokokikezazixugo.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/samantha_smile_images.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/tipoxizamulurogoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/3031/3122/files/vepilasuxofux.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4354/files/wiwivesutezurapinukugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/bitobemobuparazosum.pdf
    • https://cdn.shopify.com/s/files/1/0429/4760/8730/files/92333896775.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/wugirexamasuboga.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/33988663296.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/37886116528.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_off000085d7.bin
6cc8e274446287fcde01d75fdbdb2d12a8560e381d7917399ade3b4f4868ae93
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D7 5152 bytes
font_01_sfnt_off00009744.bin
69bd9777b5caf7adc9813047be7a09ba101cf88ba7cfd4693470d654a7a30333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9744 10456 bytes