Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f398455f427c402…

MALICIOUS

PDF

42.1 KB Created: 2020-07-22 06:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c12a79b3f826b96dcd038767563b38bf SHA-1: b16122529d1aee6b6cd1773412537211d69df495 SHA-256: 0f398455f427c402ac39cccace253cc62b0e929ca36fb1764bf9e687c338de48
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. It also contains a PDF_SEO_LINK_FARM heuristic, suggesting it's part of a larger scheme to generate traffic. The primary IOC is the redirector URL, which is likely used to host or deliver further malicious content.

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/wb?keyword=verbal%20reasoning%20worksheets%20free%20download
    • http://files.lisassalonspa.com/uploads/1/3/0/8/130873804/8097881.pdf
    • http://files.landzmanagement.com/uploads/1/3/1/3/131379828/janez_tuwokokerixav_dipoka.pdf
    • http://files.laughingbuddharetreats.com/uploads/1/3/0/7/130739269/kosoxefixosakujelox.pdf
    • http://files.yorkstone.ca/uploads/1/3/1/3/131398022/681e828c9fd68e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/76507498282.pdf
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/63913429018.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/xidavule.pdf
    • https://xomuxemilud.files.wordpress.com/2020/07/94295344452.pdf
    • https://rilamexix970799637.files.wordpress.com/2020/06/safojedatezatoxazawusos.pdf
    • https://wibujilena.files.wordpress.com/2020/07/46452416283.pdf
    • https://mupujinivibu.files.wordpress.com/2020/06/gekilupajususopaligigezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5456/files/mowawakevigoguka.pdf
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/bunulomujuzoda.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/lorofuwu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/zokedodarojeworudupakumit.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/pokefopesokugubori.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/14960609827.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/79510240433.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_off0000683f.bin
e727efbc6b0610e466347b369d9fa766bba13b5a1661ea46d62648b3ba4df82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683F 5216 bytes
font_01_sfnt_off000079ff.bin
079b59535a2f474d8101f9db6761e359f331d52853dd62ae0366f2112c82a1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 9656 bytes

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