Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39199fb1fce1cf4…

MALICIOUS

PDF

37.5 KB Created: 2020-08-28 08:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3a90c90872e02986c35f7d0291fae357 SHA-1: 5b9416b6ee374c6fcca1d00d5f0f14d4c2e361ba SHA-256: b39199fb1fce1cf46e6ff38c7476dffa73b3a9deb6ea94c9ccdb9013fef58541
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to PDF conversion and includes the malicious URL, suggesting a social engineering attempt to trick users into clicking the link.

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=convertir+pdf+a+word+editable+ocr+online In PDF document text
    • http://josokufi.m.wchqfm.com/uploads/1/3/1/4/131453133/c5d683e7.pdfIn PDF document text
    • http://files.christophersorrentino.com/uploads/1/3/0/7/130740112/riweretaresad-parajovitozuwu.pdfIn PDF document text
    • http://vudupumow.nalsofgs.org/uploads/1/3/0/7/130738836/043fa3cc676b.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/1/0438/4276/4962/files/google_camera_android_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/38559435024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1615/9395/files/69363802260.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2724/2903/files/c_c_performance_comparison.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/mah-_mba_mms-_cet_2019_admit_card.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/80933568699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/56482905782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/bolor.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 3

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_off000054e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54E3 5168 bytes
SHA-256: b7636e7272d08e19d43bdf39565e3308aa56bd31053d96638924160f7f33d98d
font_01_sfnt_off00006694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 10192 bytes
SHA-256: 4275842074f2e2ea19c610a072ad1bf73d9f9c3ed24096ac9ea56f4f012e104e

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