Malicious PDF — malware analysis report

Static analysis result for SHA-256 21130e437354ab4c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-24 11:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b725eff2c63dbe7e722ef4176a0a08f9 SHA-1: e797663c284bc3b7474174fc4deadbc1b5d90993 SHA-256: 21130e437354ab4c2d638a65dc9be3bb9e5905105d702cc312fbdb22e5c82784
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cubs+2020+schedule+pdf'. This URL is presented within the document body, disguised as a sports schedule, to entice users to click. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=cubs+2020+schedule+pdf In PDF document text
    • http://files.jeanfrankstark.com/uploads/1/3/2/6/132682303/8860886.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/1/0435/5761/7823/files/android_10_redmi_note_7_lavender.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/kozatixes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/australian_map_outline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/70811714316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/3702265320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/65008903236.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/spelling_numbers_1_to_100_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/zimobotoroxedizeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6851/2669/files/didilekapatuludigabufota.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_off00005c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5A 5256 bytes
SHA-256: 44ebc5f04e1b53847772d994564a4ef2de6c407d965dba442714dff516f88b91
font_01_sfnt_off00006e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E34 12820 bytes
SHA-256: 5bcd4b0bba1cd8126ec1f550ac6b1a8d84ba26be5c92f913eab71a11a367cf00

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