Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c4fb6584b66e78…

MALICIOUS

PDF

42.2 KB Created: 2020-08-28 06:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 95e45efa04a6836b54d3140e144a17a0 SHA-1: 8ccdd3c45a60b448fdcb1c8c62ae5d306dcb1f62 SHA-256: c4c4fb6584b66e78b55d3ea3173dde3299baa713ebfe3cab19298024b178c154
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of these links, https://ttraff.ru/pify?keyword=o+urso+polar+%25C3%25A9+branco+porque+vive+na+neve, is identified as a known malicious redirector. The presence of numerous links, including the malicious one, suggests an attempt to lure users to malicious sites or to manipulate search engine rankings.

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=o+urso+polar+%25C3%25A9+branco+porque+vive+na+neve In PDF document text
    • http://files.carrolljazz.org/uploads/1/3/0/7/130740112/gibopijoru.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/1/0437/2620/9175/files/install_postgresql_mac_brew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9359/0167/files/mobovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3609/files/86921761129.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/sanojukadifamotowowebag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/jamazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/9562415741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/lememawovesigapovunulegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8336/6551/files/gray_s_anatomy_book_40th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5171/2666/files/zajasilonulojirivekubumuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8162/1664/files/xezaposepumizunopotebomup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/62496442344.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 2

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_off00006247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6247 5424 bytes
SHA-256: d7b154e1adca2b443f3980f10b9e1b8aff6c4c6a11951a9f64bea932473b0685
font_01_sfnt_off00007486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7486 12236 bytes
SHA-256: 25923f8779a0a35b648d8f95d0e3ec8beac7742d07eb2a0fd930a03eea261f8c

Open this report in the interactive analyzer, or submit your own file for analysis.