Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55a44c8d13030b5…

MALICIOUS

PDF

44.4 KB Created: 2020-08-07 08:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cb99f493c6bb8f25febd04af95f20053 SHA-1: b71e5f7c791aacb10a36c4c5cb8f19fed7798115 SHA-256: a55a44c8d13030b54b57ac8a6284d250434a43ca6ffec9f3d9f2dec34f0866f1
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the one identified as malicious. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be a lure to a malicious website via a redirector.

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.com/pify?keyword=psychological+development+stages+pdf In PDF document text
    • http://lawup.catchacomamarina.com/uploads/1/3/0/7/130775432/gimegiwopatekob-pusogazalabu-munuviterir.pdfIn PDF document text
    • http://files.normansglutenfree.com.au/uploads/1/3/1/6/131607331/piluzilabebemexuzat.pdfIn PDF document text
    • http://files.drycjuniors.org/uploads/1/3/0/7/130739247/3562602.pdfIn PDF document text
    • http://files.threecreekaussies.com/uploads/1/3/2/7/132710655/sujut.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/1/0434/3028/1381/files/gozanenunidezumov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3986/7559/files/witizonanurutabemib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/13010987370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/audio_visual_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/86906881799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/43844444392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/suxarowenokenugigu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/fepezononurupeziwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/89224743468.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/suikoden_2_recruitment_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7528/8742/files/60447133071.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_off00006ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 5636 bytes
SHA-256: 704688ed9806d2803e8bde4d0ca50082f17d05e1ee8c2b8f1d64fb40226b3e64
font_01_sfnt_off000081f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81F5 10148 bytes
SHA-256: c03d1d969e558f0e4cab39c84567d39d7578355cccfcb018e04b7db0ecef2f53

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