Malicious PDF — malware analysis report

Static analysis result for SHA-256 efffda043473080d…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 18:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3cf9e01f21845582904971b0ecf4e221 SHA-1: fa162ebfee866a14ce32a3248a45c6be226cbe5d SHA-256: efffda043473080d968d5845e1a5ed678cddb7b8a5c28e13acb3eff9dbf44d9c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and redirects to known malicious infrastructure, indicating a phishing or scam attempt. The document body and embedded link data suggest a lure for free downloads, likely to lead users to malicious sites or malware. The ML classifier strongly supports the malicious nature of this PDF.

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=let+my+love+adore+you+song In PDF document text
    • http://files.tomdiviny.com/uploads/1/3/1/3/131380029/feniwuvowosutil.pdfIn PDF document text
    • http://files.4-states-irrigation.org/uploads/1/3/0/7/130739766/8bcd82f65e.pdfIn PDF document text
    • http://files.fieryoverforty.com/uploads/1/3/0/8/130874192/3060130.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/1/0436/9124/5733/files/vector_calculus_4th_edition_colley.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/bang_bang_audio_songs_naa_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/38596432973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9142/6469/files/57685030431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/ziwivizuvegeramuwito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3641/6919/files/angina_de_pecho_clasificacion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/bs_english_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7286/3899/files/internet_coffee_shop_business_plan.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_off00005b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B26 5248 bytes
SHA-256: 8c9dd8ecc410b964eae2ccca5a5c1671ca8adf5ee0f7d7d263f86bef601bc4fd
font_01_sfnt_off00006cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 10548 bytes
SHA-256: d161fc1ac545faf01e3b4e7419891780048358b605dc01218dcaf5be6ac7229b

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