Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ba67afe958700…

MALICIOUS

PDF

39.5 KB Created: 2020-08-09 15:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 60d0e3fe2d3b6b49979a19294da08339 SHA-1: 30442ec127e03a3df15323e0ec3d12ea06d9e23d SHA-256: 439ba67afe958700d6d60234ebd734910e1a54731f095ca37ff2bc04e7c3e5c7
194 Risk Score

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=auditing+pdf+icai In PDF document text
    • http://files.lpprom.org/uploads/1/3/2/6/132682882/nizebe.pdfIn PDF document text
    • http://ferolu.mycharlottedoulas.com/uploads/1/3/1/4/131453574/02af9e16af1c10.pdfIn PDF document text
    • http://files.originalsexyslave.com/uploads/1/3/0/9/130969004/ca2abe.pdfIn PDF document text
    • http://files.vagabonder.org/uploads/1/3/1/1/131164569/datowukepaxa.pdfIn PDF document text
    • http://kibejo.seven-lemons.com/uploads/1/3/1/8/131871699/lifadazuj_jubarojuxosupo_vuzonitezok_lipapiriwobu.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/1/0431/7505/1424/files/vawusirufolukiwubi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/17233976072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2287/6826/files/datonifelujumis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6041/8970/files/soxuvatetaxejof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/duzupijani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/valutamijufonubadot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/jodofiriwuwafozaxuxarutex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9667/8301/files/19297557178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/37692004094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/1698544071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/handbook_of_applied_cryptography_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8165/4679/files/banegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/doxuvakekaz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 5008 bytes
SHA-256: 689074d476ae3656696d23acaf398c1d31e1cf41944b38b1a240e6c7cfcc1bba
font_01_sfnt_off00006ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA0 10188 bytes
SHA-256: 7635e5d87b71195e361611ca6e2a579d1bc733fd0c9c5410438ff9bbd6808942

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