Malicious PDF — malware analysis report

Static analysis result for SHA-256 40988a0515c4fd93…

MALICIOUS

PDF

31.3 KB Created: 2020-11-06 17:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 40cc0c99752d733ca67bdc2dfa3cf0cd SHA-1: 30444af910b23b864ec7552bca9635bf53a50fb0 SHA-256: 40988a0515c4fd932091c442d6278d0ced475b87116adc5152b5c78a6c8399c4
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL is also flagged as an SEO redirector, suggesting a phishing or scam attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the primary attack vector is the malicious link.

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://cctraff.ru/123?keyword=does+spyzie+work+with+2+factor+authentication In PDF document text
    • https://dapobatajixafaw.weebly.com/uploads/1/3/4/3/134310280/ff2ea51266c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f988fb364921.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/radotejedepugotikupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417049/normal_5f9ffe6900e61.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/towakog/puedes_tener_paz_en_la_tormenta_fe_y_esperanza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce8eecc-9b47-4cd1-9338-3faa449bc13a/xibobaxexa.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/75871532634.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/basic_english_sentences_for_daily_use.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/15061856612.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/nike_desert_twilight_festival_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/unblocked_games_sports_heads_soccer.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_off00003fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FAD 5512 bytes
SHA-256: 62143a1851b1e04871355b990d79ab29180c5a826dd6ab531f57d24c7cd9944c
font_01_sfnt_off00005292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5292 8796 bytes
SHA-256: bf22851e0db19214b128e0cebe36868caad799867f07a7b4b85983518d67a337

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