Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4abecb563403cad…

MALICIOUS

PDF

47.9 KB Created: 2020-08-24 04:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 58ff25c27c8229dc2571035622c138aa SHA-1: 3844a16d9661bd206ec1100d554bfae8df6bab7d SHA-256: f4abecb563403cad4d174807a9f2078eae50ffb24f6b6a7a43edad5dde08869d
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that this link leads to malicious infrastructure. The presence of many external PDF links suggests a link farm or SEO poisoning attempt. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

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=arthroscopy+instruments+pdf In PDF document text
    • http://files.woodworkslexington.com/uploads/1/3/2/6/132681772/lapiwig-lemurivelitaro-revapero-mukatomudugeluz.pdfIn PDF document text
    • http://files.senecaflowers.com/uploads/1/3/1/3/131380258/4136797.pdfIn PDF document text
    • http://files.apollosmartbet.com/uploads/1/3/1/4/131438449/xabuwojiponako.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/1/0437/5163/7141/files/12497571890.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/rewitetesekumipepejeto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/analytical_ability_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/13854143695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6630/2357/files/bhartacha_ghatnakar_song_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/6248206700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9001/6424/files/27975509475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/intravenous_calculations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3768/files/estadistica_descriptiva_cordova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/dativifugedemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3689/3599/files/losefozibujasagekobus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/20156692245.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 7

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_off00007057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7057 5244 bytes
SHA-256: a9732668ebadd379514c01902120ec4d198d4d60b2fab482db792cfbb72c8d18
font_01_sfnt_off0000820b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820B 15204 bytes
SHA-256: 8a757ce7d79dd3ef2fcd8049fb13f087c251447a77a66d9757d56f909981d6b6

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