Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f2d33ba35ac434…

MALICIOUS

PDF

51.7 KB Created: 2020-08-20 23:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db3611f8bb0e3e653fcb07d355dc651d SHA-1: dd174423e5a84e2a999ee1fde82b7fd97f670a4d SHA-256: 18f2d33ba35ac4349745758f5406661355621634c08f36a6fd2f7b972e982b1e
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one prominent URL pointing to a redirector service. The document body, though heavily obfuscated, contains the text 'Biography of walt disney pdf' and the malicious URL, suggesting a lure to a potentially harmful site. The presence of a link farm heuristic further indicates a malicious intent to distribute links.

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=biography+of+walt+disney+pdf
    • http://files.revelstokeflorist.ca/uploads/1/3/0/7/130775063/kijus_sesadetuviv.pdf
    • http://bojos.conksbrain.com/uploads/1/3/1/3/131379803/f064eda621c3771.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/1697/3476/files/associao_de_capacitores_exercicios_resolvidos.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/animals_and_their_babies_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/xojoseno.pdf
    • http://files.mxia.people.ua.edu/uploads/1/3/1/3/131378899/goraletixil-miguwozi-zizarukorijef-potexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/photo_book_maker_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/alfabet_angielski_wiczenia.pdf
    • https://cdn.shopify.com/s/files/1/0433/8561/8583/files/bijek.pdf
    • https://cdn.shopify.com/s/files/1/0436/1535/5042/files/adenoma_hipofisario_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/87466327511.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/zapidoju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2684/9700/files/2175110401.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_off00008b86.bin
59d76198608a47e98fa926d6895066c1491925a12ccf9484714041801238d656
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B86 5544 bytes
font_01_sfnt_off00009e75.bin
8364eeaadea8e16828fac220b39469ad5cb0a6692caa260843c542498283e706
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E75 10568 bytes