Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ca077aea3cad18…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 07:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aefeee2e32b7d7652600f35c49afbe3 SHA-1: 274d4260964835d61ff7e86804b0d73698cee877 SHA-256: 05ca077aea3cad185a6ea69eb0b6e0eaafc1efb26f920f3724dd6f3e3e68aa41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/wix?keyword=staying+strong+365+days+a+year+pdf+espa%25C3%25B1ol'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which point to benign content but serve to inflate SEO. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily garbled, contains the malicious URL and other URLs that appear to be part of a link farm.

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/wix?keyword=staying+strong+365+days+a+year+pdf+espa%25C3%25B1ol
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/362633_1a00a4dd4edf4947a8229de4298464ff.pdf
    • https://static.usrfiles.com/ugd/a467d2_2da2777e37094633a1d130dca8986515.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfaa338034b746f7a4c2e5beacc168d9.pdf
    • https://static.usrfiles.com/ugd/e32576_8fdf53fa16984a469e81a8eb8ae5c533.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d449b3996d6457399ee79d7ab0a118c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9d89722f75f483983a8e7d72e5640f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a23d302d84f44745abc39ae295659b60.pdf
    • https://static.usrfiles.com/ugd/286fb8_68cad7eb733f4df79759da4faee03a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b1bded44bc649df9930a58778dcf501.pdf
    • https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/estequiometria_agamenon.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/avon_and_somerset_police_report_lost_property.pdf
    • https://static.usrfiles.com/ugd/f96b02_1691917081c449b9896b36686288c32a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2b67de8ac186408984b0f9405165d63d.pdf
    • https://static.usrfiles.com/ugd/b8c837_343b882326ca46e9b1179078fae8ff77.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_off0000606b.bin
3e1428ac8443bdeb4d38fcfeab0dade34c0efb8f54fa5eac1f221095e17a6c92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 6068 bytes
font_01_sfnt_off000074d7.bin
6eb5c0266a28102714ff22237d07d12a15d09d53f7be86ffd2c12cc6c17cf797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D7 10568 bytes

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