Malicious PDF — malware analysis report

Static analysis result for SHA-256 684afabe86cba592…

MALICIOUS

PDF

58.3 KB Created: 2020-08-02 07:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5de61a92ba0f7260745c8f3bbc3a507 SHA-1: e0db8c5b6f4a62f31b64699507e641ed00860858 SHA-256: 684afabe86cba592816807a66982e12c866b6faa7cc20e059fbf54fbce2ec91e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and several benign-looking Shopify URLs, suggesting a link farm or redirection scheme.

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=iis+url+rewrite
    • http://files.tactic-construction.com/uploads/1/3/0/7/130775828/0056311967.pdf
    • http://files.grittygoblingames.com/uploads/1/3/1/4/131411474/fovufizekitik.pdf
    • http://files.rebaspizza.com/uploads/1/3/2/6/132696214/bujidesugi_kivawovusak_jabalixosusi_nisujonanadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/4955366427.pdf
    • https://cdn.shopify.com/s/files/1/0430/1979/6633/files/rudisanetesalanegak.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/89596941944.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/tojinirufebegebija.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/lijizamilalej.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/76151473779.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/82384476829.pdf
    • https://cdn.shopify.com/s/files/1/0440/8596/9048/files/54806939707.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/74889322825.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/14586655538.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/poximuxubaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/1820/7911/files/ashen_hunter_set.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/2124980020.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/dotejulos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/justice_will_not_be_served.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_off000098d7.bin
337ad8d684b3c73c2504754a1173a3cd57ce2014219f489bb4b82658b4b0d1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D7 4500 bytes
font_01_sfnt_off0000a840.bin
be73dfd7164cc45720729e6ba59255ad54851daac8f75cd694978177a288f2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA840 16724 bytes

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