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) First seen: 2020-09-04
MD5: c12a79b3f826b96dcd038767563b38bf SHA-1: b16122529d1aee6b6cd1773412537211d69df495 SHA-256: 0f398455f427c402ac39cccace253cc62b0e929ca36fb1764bf9e687c338de48
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) which is associated with malicious activity. This suggests the document is part of a link farm or SEO poisoning campaign designed to lure users to malicious sites under the guise of free downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.lisassalonspa.com/uploads/1/3/0/8/130873804/8097881.pdfIn PDF document text
    • http://files.landzmanagement.com/uploads/1/3/1/3/131379828/janez_tuwokokerixav_dipoka.pdfIn PDF document text
    • http://files.laughingbuddharetreats.com/uploads/1/3/0/7/130739269/kosoxefixosakujelox.pdfIn PDF document text
    • http://files.yorkstone.ca/uploads/1/3/1/3/131398022/681e828c9fd68e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2079/6583/files/76507498282.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/63913429018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/xidavule.pdfIn PDF document text
    • https://xomuxemilud.files.wordpress.com/2020/07/94295344452.pdfIn PDF document text
    • https://rilamexix970799637.files.wordpress.com/2020/06/safojedatezatoxazawusos.pdfIn PDF document text
    • https://wibujilena.files.wordpress.com/2020/07/46452416283.pdfIn PDF document text
    • https://mupujinivibu.files.wordpress.com/2020/06/gekilupajususopaligigezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1925/5456/files/mowawakevigoguka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0326/3645/files/bunulomujuzoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/lorofuwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/zokedodarojeworudupakumit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/pokefopesokugubori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/14960609827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/79510240433.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x683F 5216 bytes
SHA-256: e727efbc6b0610e466347b369d9fa766bba13b5a1661ea46d62648b3ba4df82c
font_01_sfnt_off000079ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 9656 bytes
SHA-256: 079b59535a2f474d8101f9db6761e359f331d52853dd62ae0366f2112c82a1d2

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