Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8aaa0dc4963de3…

MALICIOUS

PDF

47.3 KB Created: 2020-08-14 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a02d7518dc544b2d5d4366b45c9336bc SHA-1: 2147b3e3521e8b480bf1fb8bc4812b75929c3db2 SHA-256: ca8aaa0dc4963de3fe56a5b5a5b5abaffa6a98ef680ad852e0d44d3caed750cc
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a known malicious redirector, disguised with a search query for 'tablas dinamicas excel 2017 pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack pattern involves luring the user to a malicious site via a deceptive link.

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/wb?keyword=tablas%20dinamicas%20excel%202017%20pdf In PDF document text
    • http://files.prettyfckingawesome.com/uploads/1/3/0/7/130775001/34f4af7.pdfIn PDF document text
    • http://feruxot.paulheroux.org/uploads/1/3/0/9/130969306/lulowazumegut.pdfIn PDF document text
    • http://files.fowlplaylanyards.com/uploads/1/3/2/6/132681698/darezolojogapo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/sizigababalugukudewa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/rupabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/kemirolurube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/lunef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/70272891467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/add_bookmarks_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/pocket_atlas_of_sectional_anatomy_thieme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1335/6194/files/51213650453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/cambridge_english_advanced_2_authentic_examination_papers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/49004137086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/inductive_and_deductive_teaching_method.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6443 5368 bytes
SHA-256: 5cf33189fbdebb6ff49afbf7c09c0fd5783d104bc5fa5981ea5fd5701cecec4a
font_01_sfnt_off00007663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7663 13792 bytes
SHA-256: ca1c99a8bd7664af14111a862aaa8de30a159ef2225868603954a4dba9b96b66
font_02_sfnt_off0000a0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B0 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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