Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a717c52e8f5af64…

MALICIOUS

PDF

40.7 KB Created: 2020-08-05 12:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 682ed60dc4227708e0f1f70288b8df3a SHA-1: f79400e52372026e595731da74fce7a6ace2d379 SHA-256: 8a717c52e8f5af6404baae4eb2c210a0c186e91d51374d2ff08e0777c4b1e2c8
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'arthritis uk back pdf' and the malicious URL. The primary attack vector appears to be a malicious redirector link designed to lead the user to a harmful site.

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=arthritis+uk+back+pdf In PDF document text
    • http://files.sahityasangam.org/uploads/1/3/0/8/130814258/sijabusuwifubum.pdfIn PDF document text
    • http://files.suncoastfl.org/uploads/1/3/1/4/131408371/fijodixo.pdfIn PDF document text
    • http://jojed.juliesenf.com/uploads/1/3/0/8/130874254/wizezokova_pukutojefake.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/1/0436/4979/4213/files/48515709864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/sears_garage_door_opener_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/71170397287.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0633/4888/files/68249071875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0487/files/batokurewosul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/how_to_calculate_percent_recovery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1999/2222/files/14125451187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/72553183598.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/0858/5891/files/skyrim_anti_crash_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9328/7321/files/26985614156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/sirojex.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_off000061f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F4 5404 bytes
SHA-256: 90d25d44198176c1d5fc97aa1f80e07aad6b008c70ae6f7a37ef3147dd4b4d5c
font_01_sfnt_off0000744b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744B 10012 bytes
SHA-256: 801b8bc5ca6ccae91e544a3fc539fd3133e90f2765209d423de28a8bffe96d1b

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