Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef66cdac1bc24cfa…

MALICIOUS

PDF

43.9 KB Created: 2020-08-25 15:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 91ea27f51721e8b4b4b6ddf2121cdb85 SHA-1: 51b7958986fc835a1acf251f5cf48154b79c0470 SHA-256: ef66cdac1bc24cfac32fbc6123dde1263c13f2af4b74806d7d792fdc3b93c64c
194 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though partially corrupted, suggests a lure related to job searching. The presence of numerous links, including the malicious one, indicates a likely attempt to redirect the user to a compromised or malicious site, potentially for further exploitation or phishing.

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=best+cv+format+for+un+jobs In PDF document text
    • http://files.okubostudio.com/uploads/1/3/1/1/131163599/6919005.pdfIn PDF document text
    • http://files.gregoryvann.com/uploads/1/3/0/8/130873997/pefajagonedatut.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/1/0432/0336/2973/files/mods_for_gta_5_on_xbox_360.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/zilewuxilinuwinut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/dabufeburoverexomob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/kaun_banega_crorepati_video_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8130/9083/files/9986024848.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/84651781988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6546/5245/files/9147178317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3739/9960/files/isotopes_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/xinedujowowetulomujamupir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/89660969806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/kimax.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 1

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_off00006cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBE 5320 bytes
SHA-256: 9d7fbefb4158af7adbccdb77c9d8241ec842eccbe8943a060d1fe37570394dea
font_01_sfnt_off00007ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC9 10580 bytes
SHA-256: f3f14f8d96fcffbc323dc25d1fca47018a556dfb9016b6708e624e4c5635b369

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