Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d8740a580e9a5…

MALICIOUS

PDF

38.5 KB Created: 2020-08-05 11:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 369fb5311caa2d188d0d3d1156cfd203 SHA-1: 2b4461931c8a93459240bc05cc320881852ef9c4 SHA-256: 721d8740a580e9a585d11f271861cd2f6dbb5f7f762d732266b0768e62ff9c77
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to appear as legitimate downloads, but they redirect to malicious infrastructure. Specifically, the link 'https://ttraff.com/pify?keyword=castrol+gtx5w30+c3+pdf' is identified as a malicious redirector. This suggests a phishing or scam attempt leveraging SEO techniques to distribute malware or lead users to malicious 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.com/pify?keyword=castrol+gtx+5w30+c3+pdf In PDF document text
    • http://files.1stclasshomeopathy.com/uploads/1/3/0/8/130874416/zosibazugokibev.pdfIn PDF document text
    • http://files.londahayden.com/uploads/1/3/1/6/131606056/gumixafa.pdfIn PDF document text
    • http://files.buildingyoureternity.org/uploads/1/3/1/0/131070508/b92d882c25cd0b2.pdfIn PDF document text
    • http://files.inmathclass.com/uploads/1/3/2/7/132712093/9080108.pdfIn PDF document text
    • http://files.truthinaspectastrology.com/uploads/1/3/1/6/131606533/ee0a2403a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/wakumuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1984/6311/files/75900215868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/wetigopajoxuguzolugigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/93338773852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/razekidom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2691/5239/files/93714671940.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/biludetejuvujatolometa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/57644645815.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4587/8941/files/31588622128.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/vusetinuwomewabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/blackmagic_speed_test_windows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wemulaw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B23 5452 bytes
SHA-256: 8d890b310b7fc0148347310b15bb63aa71ed39c503474fc72ca1b27dffb2ceab
font_01_sfnt_off00005dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD8 9764 bytes
SHA-256: c0bc40bef958ee60c1967fc5b0f15c7508ec79744e11b389e38d663ade7b4dc0
font_02_sfnt_off00007f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F45 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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