Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75927e2cc813914…

MALICIOUS

PDF

55.0 KB Created: 2020-09-11 01:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f360f84065eff100bf9bcefe57334dc0 SHA-1: 96aa8ad7a99d49974816cf9450fcf87537e7ec8b SHA-256: b75927e2cc813914d76442f62e24e5ce595e90a7a5a108bbf654c144b59aa0bd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, 'https://ttraff.club/wix?keyword=aap+lipid+guidelines', which is presented as 'Aap lipid guidelines'. The document also functions as a link farm, pointing to numerous other PDF files, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external links supports a malicious intent to redirect the user.

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.club/wix?keyword=aap+lipid+guidelines
    • http://files.jinkymarsh.com/uploads/1/3/1/3/131380480/bilota_goras.pdf
    • http://kugivivog.ritecookware.com/uploads/1/3/1/4/131453960/f43badd.pdf
    • https://static.usrfiles.com/ugd/80c1db_eba5c74134c240e887b4b30efc1e241c.pdf
    • https://static.usrfiles.com/ugd/b91566_d8abd0e420744448968841491202dbc5.pdf
    • https://static.usrfiles.com/ugd/e3c460_a9abea9c3f8e47bc875c2709ff5ac618.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_aaa3414f3c414ea4af055034dce41204.pdf
    • https://static.usrfiles.com/ugd/b8c837_e195907eaac446be838b39e13d16cf2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a1da7199a44c059a1aa85f7bc1cda8.pdf
    • https://cdn.shopify.com/s/files/1/0463/1763/3698/files/xosifitijen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9955/3959/files/31196710545.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/sofifarusoxulinulik.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_off00009b9e.bin
54b883d4dea3d184f4ad618481a769c8a6fa7d46bfbc605ba169cefd9dc85a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B9E 5020 bytes
font_01_sfnt_off0000acc7.bin
3a8aacf71063821e408c815056a4defe6eca57105ef9c0d76c7f148dd1d399bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC7 10272 bytes

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