Malicious PDF — malware analysis report

Static analysis result for SHA-256 5908a679fd517a7e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-11 12:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 992fb631a5f39fb393124945a79a74d0 SHA-1: 515984649f9f321242bd4843fc57c7130f1ce8f3 SHA-256: 5908a679fd517a7e337224eb4db926f9e0e9979303a8c8e6fe976335cf83d824
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download. The document body, though heavily obfuscated, contains the target URL, suggesting a lure related to educational materials.

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=math+teacher+s+guide+grade+10+pdf In PDF document text
    • http://files.graphicetch.com/uploads/1/3/1/3/131381675/3094754.pdfIn PDF document text
    • http://files.busystatic.com/uploads/1/3/0/7/130739836/tirawolaju.pdfIn PDF document text
    • http://files.dmcpraha.com/uploads/1/3/0/7/130775519/fikidomovivo-fanabigixe.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/1/0428/5893/8531/files/gugigujojepoxuri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gofifarigomikidapowokov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/fowisonigidapezudowarogux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/27643395185.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/dofevabubiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6350/9146/files/acls_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/ntpc_math_syllabus_pdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/biology_class_11_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2301/4824/files/mathematical_analysis_s_c_malik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/63363589399.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6661/2130/files/2310722764.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_off0000636f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 5584 bytes
SHA-256: 650b73a0b8223e388ffa7ab72cfd1e1049306140d06858831c308e355ade3f3e
font_01_sfnt_off00007672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7672 9708 bytes
SHA-256: 42b564b67cfa28fd080682660b55894094991d82ebde6df5cc37a68ef14445f9

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