Malicious PDF — malware analysis report

Static analysis result for SHA-256 086237b73596bd1a…

MALICIOUS

PDF

44.4 KB Created: 2020-08-14 01:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 364d30f94145853d0bede12aba3e7ea1 SHA-1: 54e7f0061b16572364487ba3f3534a68863db31f SHA-256: 086237b73596bd1a708588f267a13aa97bf419cec666368972ba5f470a28b3ff
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The document body, though heavily obfuscated, contains text suggesting it's a formal letter template, likely a lure for phishing. The primary malicious IOC is the redirector URL https://ttraff.ru/pify?keyword=adressering+formele+brief+engels, which is used to funnel victims to further 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=adressering+formele+brief+engels In PDF document text
    • http://files.littlebobtailresort.com/uploads/1/3/0/7/130776407/3179864.pdfIn PDF document text
    • http://files.adrianasamper.com/uploads/1/3/0/9/130969775/dipokepuwatuxid_sejotoguj_tazivotos_bosufas.pdfIn PDF document text
    • http://files.silverfitnessct.com/uploads/1/3/1/3/131378990/juwaxijonirabufajus.pdfIn PDF document text
    • http://files.infiniteaction.net/uploads/1/3/2/7/132712306/vosaka_pubemoxasonelob.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/1/0431/6309/1110/files/pstm_certificate_means_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/zamzar_online_to_word_converter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6080/5280/files/3963090283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/lofose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/83954775533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1281/6034/files/ccna_voice_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/mumosiketazepinoxoxovowoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/tekizugizuxupenewub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/feline_calicivirus_pada_kucing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/rubisadowuzavapirujifa.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 8

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_off000070e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E5 5148 bytes
SHA-256: af93bb679c4d6c2d5aad88bc2038ed8125909d525ac16aa3268e03a65f302f35
font_01_sfnt_off0000824c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x824C 10104 bytes
SHA-256: 9806a41c2c2899d068094ce27f9a9ff24823ae9b0abcca72c44b79d06e7bf949

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