Malicious PDF — malware analysis report

Static analysis result for SHA-256 61df6a5bf7b723d9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-07 17:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a67469771d481d23f54136d3f8984f50 SHA-1: bf816f754c8a5cab6f99951470f28edef840829c SHA-256: 61df6a5bf7b723d934a860734df3b3eeeb52a84f9a5cba806d2477d350698435
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to a link farm designed to appear as legitimate PDF documents. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=carabidae+identification+pdf`. This suggests the document is part of a phishing or SEO poisoning campaign, aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=carabidae+identification+pdf
    • http://files.mymountaindrive.com/uploads/1/3/1/6/131636807/d9f69fb032e6.pdf
    • http://files.hayeon.studio/uploads/1/3/2/6/132695575/223f5b7.pdf
    • http://nibigom.vancouveryarn.com/uploads/1/3/1/3/131380600/3058459.pdf
    • http://files.yogabluetour.com/uploads/1/3/1/3/131397964/a963de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/67142180601.pdf
    • https://cdn.shopify.com/s/files/1/0435/1993/4628/files/goxaxitamimi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/formato_de_certificado_medico_de_buena_salud.pdf
    • https://cdn.shopify.com/s/files/1/0440/1790/9910/files/alan_skowron_reverbnation.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/download_calvin_and_hobbes_complete_collection.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/84679107727.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/76942789133.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8076/files/jetavegabilimadorajozo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/les_accents_en_franais_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/pebofiwawebix.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/41549657241.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2369/files/jabirusiwapabogirizutomo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/chp_traffic_incident.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ad8.bin
68cce1073a62890c97fe19d138bf7c6fd01c02d39f4a51126d657d0fd9d18126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD8 4984 bytes
font_01_sfnt_off00007bd4.bin
dd019c31babca97839813c4796188f3ccd5cd4a0c7829ed62e8ea0759c0bbbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 10024 bytes

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