Malicious PDF — malware analysis report

Static analysis result for SHA-256 641b5832e3e0b42c…

MALICIOUS

PDF

58.5 KB Created: 2020-11-01 16:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8c184d47aae741bb04cd73fc360760ce SHA-1: 8d411fa995d5b8fe8b81b16ffef55e5cb08c2431 SHA-256: 641b5832e3e0b42c5b4d65ba355506e177435efd6ba7f4b58387b039d65ec5ef
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm or phishing lure. 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://cctraff.ru/strik?keyword=red+spotted+newt+facts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f8f41e8814f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5f9cbcd37da8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404727/normal_5f969039d8f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f9563dad4479.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/latavupefiso-xumexeromawaniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5f8fbb5db7d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369794/normal_5f9335df33f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368998/normal_5f9d236a729d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393628/normal_5f930cb59c21c.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://cdn.shopify.com/s/files/1/0429/8588/1753/files/29062609935.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/arduino_uno_working_principle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8756/7285/files/characteristics_of_a_good_leader_essay.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

Related samples 2

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7965 4860 bytes
SHA-256: ea6ca6e394ac7c6c60fbb3167a20d1cde895b1bbe38ec5cd9a29b4d326a90df1
font_01_sfnt_off00008a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A16 10560 bytes
SHA-256: 3467a7d4d6b80daff56083b3ce3f56d4e8e9376d9ade078e2f44feb21db7b2cd
font_02_sfnt_off0000ae95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE95 20048 bytes
SHA-256: c7db35eec31a17ca39a39ad66d9b703ec32eb8693e0542ceb9f93caa264f5b4a
font_03_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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