Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60937e76817bf83…

MALICIOUS

PDF

76.2 KB Created: 2020-11-03 08:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 261f901457b9da9803753070611aecc4 SHA-1: 56dc77150d32ebab24645107b447192953a3e9fe SHA-256: b60937e76817bf834b87b09806c040a52954c8fc41c86c629992df4614e38d07
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it is the primary lure. No scripts were extracted, but the presence of malicious URLs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ggtraff.ru/aws?keyword=ninja+games+unblocked+at+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f9388de0dca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f8ca603ec223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8719c3a8dfc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jivuxo/ahmed_cevdet_paa_tezakir.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/noun_pronoun_verb_adverb_adjective.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/gidivupusuwokigipusibar.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/girarigovo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/63600669576.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/file_to_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/2543634588.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC0 7088 bytes
SHA-256: de29f3b25dea256b95bf1c6ed5fde3a50bfb77f1c16945a04b4c67bf94565348
font_01_sfnt_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 5388 bytes
SHA-256: 136b390ab455c05483eea2f995a9f9fcd20e3f82029646167b043b737c1149ad
font_02_sfnt_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 16400 bytes
SHA-256: edd43cbf6572c4d1691efd207992eaad9640e37f0930364b8832e125066f48c9
font_03_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 17072 bytes
SHA-256: 413d73b876d441c32fd0cdb6a6e65912afab69ddc576971f1d2f66f1187df906
font_04_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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