Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf33795df20691a…

MALICIOUS

PDF

44.5 KB Created: 2020-08-18 14:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a96462c69606281772195cca2192a41f SHA-1: 481db9d44fb8844b725e3d7b0d8c0b4e11095254 SHA-256: 3cf33795df20691adf8d2a74997dfc558bf66d6bcb97ef4a9b32b4d9907b59b5
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to redirector infrastructure identified as malicious. The document body, though partially corrupted, includes text suggesting a lure related to "best video er facebook android", aligning with phishing or scam tactics. The ML classifier strongly indicates maliciousness, and the presence of redirector links suggests an attempt to lead the user to a malicious site or download further malware.

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=best+video+er+facebook+android In PDF document text
    • http://jupis.mrtoddsclassroom.com/uploads/1/3/1/3/131380213/3bb8879153d788.pdfIn PDF document text
    • http://files.ebresearch.org/uploads/1/3/0/8/130874411/miziluzivujogujuji.pdfIn PDF document text
    • http://files.timwarnerlab.org/uploads/1/3/0/9/130969714/9903433.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/1/0432/9802/9733/files/9360554493.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8138/4604/files/72734074481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1827/3446/files/askep_fistula_ani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/loposowuzakofatala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0846/5828/files/62136689930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4603/3818/files/dakutenag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/wepagexutopotefojez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/dyt_4000_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5842/9089/files/85669852417.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 2

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_off000062a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A3 5084 bytes
SHA-256: 727e3dde50e491c4862ad451b16105377b855710bb6d7dc3f061a1424fefd4f4
font_01_sfnt_off00007405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7405 10120 bytes
SHA-256: d2eb9a3968e654de227832b184bcb8bb4d3e53bfd1b6f519bdf08fe9a20e3bae
font_02_sfnt_off000096be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96BE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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