Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bef12231eda0b9…

MALICIOUS

PDF

45.8 KB Created: 2020-09-13 03:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d052cbd478091b78d23e1ad2dfeb1028 SHA-1: d6bc98a4f1b303e58a65e9382e49b4cf8ca1f041 SHA-256: b1bef12231eda0b9193dfc93811e1e7f0c98b8f9ee0d79530b57d2bfb2a565da
194 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, disguised with a search query for 'calculating atomic mass worksheet answers'. This suggests a phishing or scam attempt to trick users into clicking the link. The ML classifier and heuristics strongly indicate malicious intent, likely to deliver a second-stage payload or lead to a phishing page.

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.link/wix?keyword=calculating+atomic+mass+worksheet+answers+chapter+4+section+4.3 In PDF document text
    • http://sabotubo.mywildbeat.com/uploads/1/3/1/0/131070487/1925496.pdfIn PDF document text
    • http://files.thestaratstar.com/uploads/1/3/1/6/131606003/jolanunewup.pdfIn PDF document text
    • http://files.mountainview.gasconline.net/uploads/1/3/1/4/131406149/10b794b2b4ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/0c4177_c386b0076d1c4796a72c1e8cc8f13c07.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bb05c1_71a472b8089943be96114c1799ed5e5d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/95089d_2e9a9f40aa5c4d26a34419f647009498.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5f4192_620ef024797348a39d88327168721ee5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/90156244687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9060/0355/files/sukadanigufemesajeboromix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8236/7385/files/gixofopotivuvikove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1840/7335/files/cochrane_systematic_review_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/pewejasodakarafojunedado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/jipekewilixewesonibekavok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/78925430272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4024/9755/files/work_rules_book.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 7

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_off0000736a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736A 5692 bytes
SHA-256: 1c6d78531e726ebb7049490a1e32f68098a469bf8c54a94b576c65c33fb53f6b
font_01_sfnt_off000086b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B9 10192 bytes
SHA-256: deff2543ccc5ad2e22b8644cc92e6a2a92bb1f3681b9e85493d1c0e184d93ac6

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