Malicious PDF — malware analysis report

Static analysis result for SHA-256 918bc6617c6b7850…

MALICIOUS

PDF

55.8 KB Created: 2020-08-20 00:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6f86f75564584afa5b201c45a2c723da SHA-1: ddcc05b26c288782c431431d1c30eb773d6d8df5 SHA-256: 918bc6617c6b78507f2b3bba886fe12ee8bd43ce9346828b22ba2d861b82adca
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=acute+tubular+necrosis+review+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user. No scripts were extracted from this sample.

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=acute+tubular+necrosis+review+pdf In PDF document text
    • http://files.teachwithssb.com/uploads/1/3/1/3/131398338/zevus.pdfIn PDF document text
    • http://files.azvrha.com/uploads/1/3/2/6/132681304/donuviguxize-runokaxaw.pdfIn PDF document text
    • http://xibewavo.reachwaupun.org/uploads/1/3/0/7/130776603/gugusew_bokot_jajofefomak_sajuzomuwu.pdfIn PDF document text
    • http://files.jcacm.org/uploads/1/3/1/1/131164462/7692550.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/1/0437/8768/1954/files/49521303287.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/gomejutokesinudozonojok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/11028202468.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1466/5886/files/wazima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/8968/6681/files/59010168745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/biochemistry_mcqs_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/87596710107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0660/5981/files/indesign_brand_book_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/guvezevejuxib.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_off00009a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A69 5428 bytes
SHA-256: 47ad3fdb0b676fdc9222bb14af9f4c73c785994adfaafdc0d0155a4a54633906
font_01_sfnt_off0000acfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFA 10972 bytes
SHA-256: 3fd456177342c178ef705b9f80152c0fd555722b9a5894bbb6018012142d2c33

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