Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91c5e936fa57f36…

MALICIOUS

PDF

43.0 KB Created: 2020-08-15 02:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 847ff5d2646bf10e69e5ab9070575887 SHA-1: 4b4a6e4f7f2f14cd32b3399796bd10ee74df1858 SHA-256: e91c5e936fa57f362f74b4f5632785daead21fe944da680873759788475c9ec5
202 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download button, intended to lure users to a harmful site. The document body, though heavily obfuscated, contains the primary malicious URL. The presence of numerous embedded links, many pointing to Shopify, suggests a link farm or redirection strategy. The file was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which may explain the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=define+conditional+formatting In PDF document text
    • http://files.bbpregistry.com/uploads/1/3/1/3/131398036/busasosu.pdfIn PDF document text
    • http://files.hannahmdesign.com.au/uploads/1/3/2/3/132303219/3182323.pdfIn PDF document text
    • http://files.chant-elle.com/uploads/1/3/1/3/131379057/45764.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/1/0429/6137/1290/files/12796272196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3825/2954/files/tefefukasipem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6797/3538/files/origin_of_bantu_migration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3844/0604/files/morfologi_bakteri_bacillus_subtilis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5806/0703/files/fakubudelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/91155990480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/rejaveg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1313/4741/files/zesifetexuxiwageb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/6072/7703/files/blackbird_guitar_duet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/tolefivifotebezidusilala.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_off00006971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6971 5164 bytes
SHA-256: 150f12ebddc239e0ffab86320ae7233bfeae90d942ebb0debcf9a7e97f899ffc
font_01_sfnt_off00007ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE7 10748 bytes
SHA-256: 3620a9f836e3c059a4e7a371803e8131ec7668336edb457baa6671398cd02422

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