Malicious PDF — malware analysis report

Static analysis result for SHA-256 7228b9552d14f908…

MALICIOUS

PDF

45.9 KB Created: 2020-08-07 06:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66fb459d0c8ee0d828a4e066a9843cad SHA-1: 222fe75de9b1056a9bc500bcea22e9896f9da2f9 SHA-256: 7228b9552d14f90859803c9c2fa4607fc6a767a51a738c7bbb37e7e2916cf8c5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one prominent URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'infrared spectroscopy absorption table pdf', likely to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, and the presence of a link farm points to SEO abuse for traffic generation.

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=infrared+spectroscopy+absorption+table+pdf
    • http://files.citydogsrescuedc.org/uploads/1/3/1/4/131437977/bomuvawixuvosa.pdf
    • http://dazite.secondchancedogrescueofiowa.com/uploads/1/3/1/3/131398560/kaxoginix_punuxebejodir.pdf
    • http://files.bamboozlestraws.org/uploads/1/3/1/4/131454581/2882734.pdf
    • http://files.vitaresources.net/uploads/1/3/1/4/131453151/wuxeku_pusobiw_bosojiwiwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/98501617501.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/19810684475.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58933331969.pdf
    • https://cdn.shopify.com/s/files/1/0434/5243/2537/files/breakup_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/tofemabata.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9029/files/zodekutufolu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/state_kirchhoff_s_law.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/moguzofiziduwezorixe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/rudram_chamakam_tamil_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/nj_transit_bus_schedule_191.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_off000068d3.bin
42814d5fe8b1977fa521ff998d0be5914e37b77a655dfa9b5d7e58827635c4af
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D3 5328 bytes
font_01_sfnt_off00007b07.bin
0f8dd5b957296337309784dd32ccb1d944d50f66b17a0ab924be174d32a7c5c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B07 15136 bytes