Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b33dc4a4b514660…

MALICIOUS

PDF

61.7 KB Created: 2020-08-11 07:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 328417a8dbabd4c8c0dadbdf4914baf7 SHA-1: c75f81041f71d698de44f723504083e38dd6812c SHA-256: 4b33dc4a4b5146603674f810fbdaf7885c30f9e2979d2bda501c78a082f938bc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including one pointing to a known malicious redirector, suggests a phishing or SEO spam attack pattern. The primary malicious IOC is the redirector URL.

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://ttraff.cc/pify?keyword=antiphonale+romanum+2020+pdf In PDF document text
    • http://zugaviwe.olivessouq.com/uploads/1/3/0/8/130813528/tevokal.pdfIn PDF document text
    • http://podido.drhafezi.net/uploads/1/3/0/8/130874474/58e51b5.pdfIn PDF document text
    • http://files.centralsecurityservices.net/uploads/1/3/2/6/132682790/5862235.pdfIn PDF document text
    • http://files.ballouhsphysics.info/uploads/1/3/0/7/130739061/kisuwuxafidupowosezi.pdfIn 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/1/0434/5564/3813/files/gegaxudanifox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/dewidimalafituz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/goduzezubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9302/4151/files/69825434867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/81380392621.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4680/5404/files/tunudadokokux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/nazoronarafemafata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/hanuman_chalisa_lyrics_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/78993660982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/g_eazy_one_of_them.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/gossip_girl_cecily_von_ziegesar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/44704226932.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 3

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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 5368 bytes
SHA-256: 8ac8cab046ca4e7ee3825da27ca16bd1398ab57a2136a9f393c8e6bf001cc45b
font_01_sfnt_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 10504 bytes
SHA-256: 3ced05e3a7f29b3b828b5b6a057a7da74d8be71eb6193f0208725789386ac58b

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