Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda750e911d86ddd…

MALICIOUS

PDF

43.3 KB Created: 2020-10-28 21:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0a5804b07a47abfe41fdb736d194b096 SHA-1: 8f3b4d36a9d83217c0b9473a5935a6332975dbdd SHA-256: cda750e911d86ddd16a0115851606d7554d4e394fbda3f5b8f867836ff42e714
194 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 infrastructure, specifically `https://cctraff.ru/strik?keyword=mandolin+chord+charts+printable`. The document body, though heavily obfuscated, contains text related to 'mandolin chord charts printable', suggesting a lure to disguise the malicious intent. The presence of numerous other PDF links, many pointing to benign Shopify URLs, indicates a link farm strategy to obscure the malicious destination.

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=mandolin+chord+charts+printable In 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/1/0437/8332/3806/files/numebufegoxitudab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/crenova_projector_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7898/7165/files/millennium_falcon_interior_cockpit.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/zerivorenolex.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/spiderman_future_foundation_suit_ps4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9529/2059/files/convert_sheet_music_to_midi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/mapevum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3870/2748/files/59371308726.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/lamento_della_ninfa_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1411/7293/files/69460066688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0771/9603/files/kizixurigig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/evil_eye_plus_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/zonagawukajufufexuxubup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5431/9774/files/tar_beach_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2626/7291/files/pepexibawarim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beeff33f-d959-481b-882c-afc000a02dc2/xubofarelo.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_off0000697e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x697E 5304 bytes
SHA-256: f35576f19f9a450b2238bc8da35acede3614ea1fb0347fc062572ff3fbe40445
font_01_sfnt_off00007b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B81 10780 bytes
SHA-256: 5578affde373cf46af1e78fb2bc13792be4059048ddc12834c44786e2668436a

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