Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd3af12eb90f3bb…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 14:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 96c2a085aea83f241f12dca6b1bd7a29 SHA-1: c38959e79a6d973f17d11a93c0340c313c53fce3 SHA-256: 5cd3af12eb90f3bb90f8523fcfeef87946a8fbfcdee94dfe14c01497320d9e98
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, many of which point to a redirector service known for malicious activity. The document body, though obfuscated, contains text related to 'time worksheets grade 4 word problems' and a URL that further reinforces the lure of free educational materials. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to potentially harmful sites, likely for phishing or malware distribution.

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=time+worksheets+grade+4+word+problems In PDF document text
    • http://files.expiredposters.com/uploads/1/3/2/6/132682745/2688766.pdfIn PDF document text
    • http://files.joinerystudio.com/uploads/1/3/1/0/131069812/nokuzesawo.pdfIn PDF document text
    • http://files.necelderscouncil.org/uploads/1/3/1/3/131383657/cc5bc.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/1/0434/0659/0106/files/english_to_bangla_vocabulary_for_ielts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/27437325003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2914/7293/files/ejercicios_resueltos_de_capacitores_mixtos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/49167944743.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/12451692107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5986/3959/files/wogotimivopejum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/defozopopovubemape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9423/7599/files/nebonipomefazulimoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6624/2710/files/delifemozal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/51884018290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/56196573433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9848/6424/files/komezarizifaxixokeridema.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/vomog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9199/2480/files/lpu_assignment_front_page.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B0 5704 bytes
SHA-256: 568d97bdfa7b0b4bfec4af59125a2cb9d5dc1fc03bc2129ad985d8ce0bd36ff3
font_01_sfnt_off0000750e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 10116 bytes
SHA-256: 93f0c5b6203c17962083ca87c469d10c52bc8a912961bacbc5af92c967d00ab0

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