Malicious PDF — malware analysis report

Static analysis result for SHA-256 8939ed63446f6ae8…

MALICIOUS

PDF

39.9 KB Created: 2020-11-04 13:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dd87d259095428334642688ef4f6b8e3 SHA-1: 2fff58d0a50354408ac4b27dec5deeb20e27f3d0 SHA-256: 8939ed63446f6ae84b55bb675aa3fd11abbc02fd367f00c61df82a247402f921
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that point to a known malicious redirector. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates this is likely a phishing lure for free downloads. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL used in the lure.

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.
  • 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.me/123?keyword=words+with+ore+in+them In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f953dc560485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f9052c2f05b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8bc7919f611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f96351809f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f95b07ec6edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f9df5c4f04bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5f9dcf9d48596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5f9657df6c492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_5f93e0d8270b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f9811327d4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f8881b4c308f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5f8f34e9afdd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petikamov/ketchum_public_schools.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/feminist_literary_criticism_definition.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A42 4928 bytes
SHA-256: 6e1f0fa337dd5710e9acaefd8dfc9b180a809958ddb3b2eb15e8658b565ca50c
font_01_sfnt_off00005af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF2 10196 bytes
SHA-256: d67d8d20c0d313041625d1d5ee8caba3eb164609abf2abbd9cb9403c8834f711
font_02_sfnt_off00007e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E12 16076 bytes
SHA-256: 9605e1d03be989d6031878619259f35ebdba74de05da97e2d7db08892469389f

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