Malicious PDF — malware analysis report

Static analysis result for SHA-256 99de3cfba02210ca…

MALICIOUS

PDF

81.5 KB Created: 2020-08-24 05:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 26ecba16bb1c7353a67a83c276a8ab8a SHA-1: d778b2fc89ccc656393b8d4c540069e180e7ca87 SHA-256: 99de3cfba02210ca5eb1762f7e6c95659335fab0f4219a0eb6b2eab46cfd1edf
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at `https://ttraff.cc/pify?keyword=febrile+neutropenia+prevention+guidelines`. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a lure to external malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=febrile+neutropenia+prevention+guidelines In PDF document text
    • http://files.joyingrief.com/uploads/1/3/1/0/131069808/viribufapi-xomovuvo-raseduj.pdfIn PDF document text
    • http://xudog.martelart.com/uploads/1/3/0/7/130738731/2427366.pdfIn PDF document text
    • http://files.desireandsuccess.com/uploads/1/3/1/4/131453253/3407488.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/1/0431/7688/6431/files/rixuwamu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8463/4530/files/62559133018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1347/8312/files/76302412814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9692/3555/files/my_beautifier_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/1863/2598/files/47938208055.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/86813659155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/moxiwinepegekokanefikasow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/8112/5278/files/52176718860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/wefijovapofuvixovotimeta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/27418103083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/socialismo_democratico.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 5280 bytes
SHA-256: 4ca1cc24920771314720e1c9ea343374ed54db135d063cc1d6d900f2fdcff335
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 15644 bytes
SHA-256: 468f2077871b650d5ec85fe33ef9ad7b5fad7a9b999774f11688ec2f824c4d63
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16320 bytes
SHA-256: dc5cbbf61a8f4f6ee329843406fa4b8c11ef30ffe5c8da1bfc032fb961a1f704

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