Malicious PDF — malware analysis report

Static analysis result for SHA-256 46faa27d5408067d…

MALICIOUS

PDF

36.2 KB Created: 2020-08-16 18:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc07067f29279e3d169c45c4a8cc9029 SHA-1: ca733ec10d0b3a53994265f0322fb536077caa14 SHA-256: 46faa27d5408067d6924e6a27c2105f5d89c25ba182f70cf83b67e46df272f63
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, many of which point to external PDF files. One of these URLs, https://ttraff.cc/pify?keyword=esge+guidelines+choledocholithiasis, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site.

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.cc/pify?keyword=esge+guidelines+choledocholithiasis
    • http://files.ctai.ie/uploads/1/3/0/7/130775306/9409589.pdf
    • http://files.maria-cipriano.com/uploads/1/3/1/4/131438641/revaka.pdf
    • http://xuxun.pcaspiritstore.com/uploads/1/3/2/6/132695278/wiziloparo_misubib_gisagegebi_xoguma.pdf
    • http://zovow.1as.ency-education.com/uploads/1/3/1/4/131452861/bd36f6.pdf
    • http://vurus.widlundbrothers.com/uploads/1/3/1/1/131164250/3721090.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/54491086897.pdf
    • https://cdn.shopify.com/s/files/1/0438/5354/5632/files/citra_android_supported_games.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/13414104539.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/83657030260.pdf
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/que_es_administrador_de_dispositivos_en_informatica.pdf
    • https://cdn.shopify.com/s/files/1/0453/3213/6091/files/accidentes_nucleares.pdf
    • https://cdn.shopify.com/s/files/1/0437/1978/6645/files/classification_of_antibiotics_according_to_mode_of_action.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/31589761584.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/fewosexedokugapesi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6195/9070/files/magyar_alaptrvny.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3169/files/teoria_del_aprendizaje_social_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/duwaxufezemurogagur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gekubamunanapomokavonata.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_off00005035.bin
2d4f9a0c9fe668c44a2b39bf9ee440c421801185590b8037dc70be6abc79638c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5035 5060 bytes
font_01_sfnt_off00006166.bin
7fb84c8756572a88cb2bf7ef3b851266da611f5e840c485a80a3239e2c5b10ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6166 10104 bytes

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