Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6944f506bd1cff7…

MALICIOUS

PDF

48.5 KB Created: 2020-08-10 02:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 45d7123b6e6cab91944fb70fe1dd5e58 SHA-1: 286a2206f5f53a202a9dd3657382d4cdf30b91b9 SHA-256: d6944f506bd1cff778d17b0a7cbb63a698a950d758d545a693734a687d2c0f5d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to an SEO redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains text suggesting a lure for an 'english basic book pdf', and the embedded URLs reinforce this by linking to various PDF files, some of which are benign but others are part of a link farm. The primary malicious URL identified is ttraff.com, which is flagged as a malicious redirector.

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.com/pify?keyword=learn+english+basic+book+pdf In PDF document text
    • http://files.romancingrecipe.blog/uploads/1/3/1/3/131379321/3807798.pdfIn PDF document text
    • http://files.karenodden.com/uploads/1/3/0/8/130873923/1965444.pdfIn PDF document text
    • http://files.dessaeventplanning.com/uploads/1/3/1/8/131871894/rusupinajizi.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/1/0434/7346/9597/files/rufezowubuwowinuwejezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/r._t._o._exam_question_papers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8515/8813/files/16335635353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/the_wolf_of_wall_street.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/rifup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9151/6828/files/ravapibejokug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1806/7866/files/zeniwifudodikavop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/xedolukap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/tafufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/zorotoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/el_aparato_reproductor_femenino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/8229039680.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC9 5564 bytes
SHA-256: c161100292a6147b0e0281ce9e5de90489cfc5cc9839cf41dd08ce323131ae81
font_01_sfnt_off000092ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92AD 10184 bytes
SHA-256: d468bc7b255f84806e78dcd54b946d7653ada3ca2c41c17db18d96d740282d5f

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