Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3a5001cbb31f44…

MALICIOUS

PDF

41.5 KB Created: 2020-08-20 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 334f8b2dd0c02e2c319c96727215070b SHA-1: aa025b345eb9ef52d7ffc3a6a4012ed67ddd3b8e SHA-256: fd3a5001cbb31f44b9060f5af943a5fd17d0bae8e04d16cd2154c408fdfa0a1f
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a primary redirector URL, indicating a phishing or malicious redirection attempt. The document body, though partially corrupted, suggests a lure related to 'activation energy diagram worksheet answers'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including one to a known malicious redirector, supports this assessment. 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.com/pify?keyword=activation+energy+diagram+worksheet+answers In PDF document text
    • http://files.vitalfitness.info/uploads/1/3/1/4/131408572/veladezapu.pdfIn PDF document text
    • http://files.flogrips.com/uploads/1/3/2/6/132682974/3649491.pdfIn PDF document text
    • http://files.kevinanglade.com/uploads/1/3/1/8/131856844/7c1eba2fa301.pdfIn PDF document text
    • http://biderewar.gilpinlibrary.org/uploads/1/3/0/7/130776265/3e5249944d5a7.pdfIn PDF document text
    • http://files.swaggerstateathletics.com/uploads/1/3/1/6/131637656/3f8e38e3c5ab2.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/1/0437/2296/5160/files/pm_awas_yojana_2020_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/49506077272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/9510/0311/files/agnieszka_szulim_piotr_woniak_starak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/bibla_ne_shqip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/91207782135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/92842493179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/luxaganaxifazuxuxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/8326/3141/files/always_bon_jovi_partitura_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/56857835897.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_off000062f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F1 5628 bytes
SHA-256: 4f09181b8c64923660dc2ec4eeaef8cfc857d118f25f883358918877261c60ce
font_01_sfnt_off000075fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FD 10204 bytes
SHA-256: 1dbacc0b7d7b7588ef10e60998402e9f21b4a3bc7496b8690a34a39725d8bd64

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