Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50f2130d62b8fb7…

MALICIOUS

PDF

51.9 KB Created: 2020-08-15 02:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4195c21de0b6d2c37bc03cee87a84ac1 SHA-1: b7ec8773f6264f2b75253499f443be5f6e09affb SHA-256: b50f2130d62b8fb72263e7977b0a54f42614bebf3183e0cabdcc74a09368f660
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that lead to a redirector URL, disguised as an exam application form. The primary heuristic indicates a malicious redirector link, and the document body contains the lure text along with the malicious URL. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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.com/pify?keyword=ctet+exam+date+2019+application+form In PDF document text
    • http://files.horsetoheart.net/uploads/1/3/1/3/131383456/5659c3.pdfIn PDF document text
    • http://poxuwadek.bethsblessingsofindiana.com/uploads/1/3/1/4/131408027/8432427d25de.pdfIn PDF document text
    • http://files.regeneratecounseling.com/uploads/1/3/1/6/131636654/34c2a.pdfIn PDF document text
    • http://files.reddeerkinettes.ca/uploads/1/3/1/6/131607117/tunafavarulefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/63181593236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1473/3480/files/74824709463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/gufodaneg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/48052349487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/gotomonob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/xulirixaluzexof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/3rd_class_english_grammar_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/daxug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/11227250142.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5398/1594/files/24344933960.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C98 5580 bytes
SHA-256: c0d0f3205036c8a641f1916c5dab0a98c16e2ad4c9307751eef7645e3fd5b849
font_01_sfnt_off00008f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F88 10768 bytes
SHA-256: 7e10bd6ae7fa51b3f91e109aeb14f94d1fa6c6d6e8b166c56c750184ba31e2cb
font_02_sfnt_off0000b44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44E 3776 bytes
SHA-256: fd9508b8a355b1dcf0ac53030005f079175ab5094d68ae1ef1f8d7d2fbf45dbc

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