Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e66bb7e9e5050b…

MALICIOUS

PDF

37.2 KB Created: 2020-08-13 01:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 52d575b0b36e62e031426df49a18e1c4 SHA-1: bb18df1df3ceb5beb50a2b2743b1702f9fa8566e SHA-256: 37e66bb7e9e5050bcf6df6f3f4a847bf6fa2253c63bf62fa91ef0f5cfd3e3758
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Shopify and appear to be SEO-optimized lures. One critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/wb?keyword=jurnal%20gastritis%20erosif%20pdf`, which is likely the primary malicious payload delivery mechanism. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious redirection attempt.

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/wb?keyword=jurnal%20gastritis%20erosif%20pdf In PDF document text
    • http://files.nxintl.com/uploads/1/3/1/0/131070911/nufawefomojoge_tadugusovok.pdfIn PDF document text
    • http://files.arlingtonteosinte.org/uploads/1/3/1/4/131406629/vusiwipa.pdfIn PDF document text
    • http://pifig.mail.shoreliteracy.org/uploads/1/3/1/3/131398097/8565179.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/1/0435/4975/3507/files/rubanibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7886/8387/files/atul_maheshwari_paper_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/oxford_dictionary_of_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/matizibubudovunagapevafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/54716851666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/62999068622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/temarumipufonuwuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/bamigowasozakor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/acquainted_with_the_night.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/statistical_quality_control_eugene_grant.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 4

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_off000053ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53FF 5200 bytes
SHA-256: 53f192fc8ffbe5c6cb8d9fbf930a281b9a77cdbe106e6c5171dc596c87574b2a
font_01_sfnt_off000065ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 10008 bytes
SHA-256: 1c688446214af40f620a34da3208784c5a92aea15aa85e029e1900785ae548b9

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