Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51a875ca42c07ac…

MALICIOUS

PDF

36.3 KB Created: 2020-08-23 18:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a0bb1e45cab307f5e892e62483c9cd03 SHA-1: 7b1f7611e16b1b6d9d66c14dad293e4fb41e52b7 SHA-256: a51a875ca42c07ac64e96531ac0f7df3d9a8167a155c57b72080d89426d98568
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though obfuscated, contains the target URL, suggesting a lure for users to click through to potentially malicious content. The ML classifier also strongly indicated maliciousness.

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=coin+toss+ringtone In PDF document text
    • http://files.webberweather.com/uploads/1/3/1/3/131379820/4842439.pdfIn PDF document text
    • http://zesiro.adgermanwarehouse.com/uploads/1/3/2/3/132303382/426729.pdfIn PDF document text
    • http://fozovitak.oriontrainingsystems.com/uploads/1/3/1/3/131383363/difepora.pdfIn PDF document text
    • http://files.beautifulshares.com/uploads/1/3/0/7/130738700/541ec0950fdf32.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/1/0431/0263/4148/files/gajodugetakinobarezet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/augmented_reality_android_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/analog_trip_in_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/2927/5295/files/anaconda_mac_os.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/81346474426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/chatham_county_probate_court_forms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/58033854507.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 5

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_off00004b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B30 4516 bytes
SHA-256: c14d10bcd22d64e03f0fe8c41d8c701bb25e513767093bf905f4b721ff20530d
font_01_sfnt_off00005a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9A 13484 bytes
SHA-256: abde5aff8a9e280b8c28908f1a2a125ee5ca34e134634fda6b9855a71c97206f

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