Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a37dc058d1f25ac…

MALICIOUS

PDF

40.9 KB Created: 2020-08-14 23:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 798a111d3294057168b7c707bce9851b SHA-1: 880dc05d50e7d8f1fb6927e2a2b1d2565dc6c5a7 SHA-256: 7a37dc058d1f25ac565ebd3530949a9ca98b052b33899f413609fee2245f8d2e
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains text and URLs suggesting a lure for downloading software, specifically mentioning 'Android sdk install ubuntu 16. 04'. This indicates a phishing or social engineering attempt to redirect users to malicious infrastructure.

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.ru/pify?keyword=android+sdk+install+ubuntu+16.+04 In PDF document text
    • http://files.lightningridgerealestate.com.au/uploads/1/3/2/8/132815961/tuwor.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/1/0428/9835/8432/files/mozesuseb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6866/4481/files/roxodutazepus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0087/9515/files/pepubeboto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7976/8995/files/kudvenkat_sql_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/vugusekomajanu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/kifuropoduwib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/jewarasire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5283/3695/files/dovemibel.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_off00005429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5429 5244 bytes
SHA-256: dc7a89b9dc8f864ad3ff931ebd132b0fb448f08bd759a1091da52b11bede281e
font_01_sfnt_off00006609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 10244 bytes
SHA-256: d59526028d7a01dc89dd22add166000bffc018b938dc5d863c7f2573d197af3f
font_02_sfnt_off00008918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8918 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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