Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51b59154fe85ec7…

MALICIOUS

PDF

51.3 KB Created: 2020-08-31 03:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 251b73140abab1dad00fca08911489de SHA-1: aba22cb3b34d16410851170c01ebf3aff21e209e SHA-256: e51b59154fe85ec7b51fcf9a7b440aac83fa3c69602f3f4faeb0d0ea3e38135a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=the+cosmic+doctrine', which is likely used to redirect users to a malicious site. Another heuristic identified a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0436/4029/1486/files/wukuvililukejexesaxewizo.pdf' being the first listed URL. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=the+cosmic+doctrine
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/wukuvililukejexesaxewizo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/bangalore_days_movie_with_english_su.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/wiworurazos.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/bullying_escolar_en_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/vebosobuvijakegimejevep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/0867/2423/files/gikemorabiwumerujeteb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/2020_buell_1125r_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/download_powerpoint_for_mac.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/mafuzavukonikisawipaped.pdf
    • https://static.usrfiles.com/ugd/b8c837_b15a3ae8ae444835aaddf3d67db363c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_eaae1dfab0194ee98b52822050200f18.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b978cba329c4ad791d0f43ec05f9913.pdf
    • https://static.usrfiles.com/ugd/9219f8_d1cc32b639564c9ea7b0abd5c0ec6f16.pdf
    • https://static.usrfiles.com/ugd/a771bd_29843e12f3314a7982b09c117d2dcdc8.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_off00008db5.bin
5e5f5d2070a8914c0394a725d5c6a932d37d775d05258eaa7ca357b3eb3b2d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB5 4888 bytes
font_01_sfnt_off00009e29.bin
2da2e92e91ee5850d8f3d1b18b7f12e99c2160d23381b276c2df610292662981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E29 10088 bytes

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