Malicious PDF — malware analysis report

Static analysis result for SHA-256 7673f47b31297923…

MALICIOUS

PDF

34.1 KB Created: 2020-08-02 15:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b5eaff51f139dbe2a14d5fdbeefc8a82 SHA-1: 84da9dd130b14034b8732513ee89a8624c978c40 SHA-256: 7673f47b3129792349abad41626a4c136ec91f79a08d2acb38503bfd89b56c16
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, suggesting a link farm or phishing attempt. The primary redirector URL is https://ttraff.ru/wb?keyword=conjugating%20ar%20verbs%20worksheet, which is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=conjugating%20ar%20verbs%20worksheet In PDF document text
    • http://files.stephartist.com/uploads/1/3/1/3/131379049/7468923.pdfIn PDF document text
    • http://files.miriambrookman.com/uploads/1/3/1/4/131453213/efc3b.pdfIn PDF document text
    • http://files.musicattheoldchapels.com/uploads/1/3/2/6/132682813/5121671.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/1/0431/5647/1959/files/15334644482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/ridgid_shop_vac_4_gallon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/gold_gym_resistance_band.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xopiforosolakalaxelavur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/dark_souls_2_sotfs_cheat_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/vibamofironupupuris.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/rexerexaximuziwavola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/xudexix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24413790208.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/71407137184.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
🗂 Part of campaign: lumianna.fi 5 samples

Related samples 6

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_off000047cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47CC 5252 bytes
SHA-256: ec61afaf3944a2abe9fa2f15f9d7b9cc09e7ead94f5dfd58cd082a1b00c83deb
font_01_sfnt_off000059bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BB 9968 bytes
SHA-256: e775eda4a05a643538952cb82f6eebc23aa221d3643db25d3a711ec90ef73014

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