Malicious PDF — malware analysis report

Static analysis result for SHA-256 842dc8bb75b2fd9f…

MALICIOUS

PDF

32.8 KB Created: 2020-08-20 22:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 68cd7a0533d20eb9232befeb6c216ea0 SHA-1: b8bb01e3d666fcd487d901e193dd8bdf8cd35c4b SHA-256: 842dc8bb75b2fd9fdd84885fd337f610801d6c009ce0dd3a05a837b9d3b0b3dc
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a phishing or scam attempt disguised as an 'irony worksheet answer key'. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a lure to download further malicious content or redirect to phishing sites.

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=irony+worksheet+5+answer+key In PDF document text
    • http://files.rudolfiartworks.com/uploads/1/3/0/8/130813692/disutuwisi_tapedelopujufa.pdfIn PDF document text
    • http://sidusawaz.homedefenseshow.com/uploads/1/3/0/7/130776644/jonitanum.pdfIn PDF document text
    • http://files.thespacemaker.net/uploads/1/3/1/6/131607185/b640640601.pdfIn PDF document text
    • http://files.casaofcentraloregon.org/uploads/1/3/1/3/131398117/zamazusekepapon-tejozupoma.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/1/0434/7081/5397/files/xefenuritapanaxufavuzizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3283/0106/files/zuzodak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/xosasukuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/albumina_humana_grifols_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/zakatuwunakexaboras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3627/files/jivefeme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/adjournment_application_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/divejutajos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/72054319008.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_off00004565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4565 5060 bytes
SHA-256: 36fc2b49279fcd7c6713a73a674b1fb902c729712e51232481dffd13e6d53db9
font_01_sfnt_off000056b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B5 9356 bytes
SHA-256: 93fdfe09aa0a36bd222b71e9a462080de026690f56631dc9add964d897a1e412

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