Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4cca896765fd1f…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 04:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 36f44062d1333ab603478706c9991333 SHA-1: 3033e5397aadae967aae130ac49cd18366b3a130 SHA-256: 4b4cca896765fd1f6a7c5c2f1ca6ae9a3900fa0a0462d10946a9aa5dbdeb67d9
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.com/pify?keyword=technogym+artis+run+pdf In PDF document text
    • http://files.judyatraveny.com/uploads/1/3/1/3/131398134/8c242.pdfIn PDF document text
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdfIn PDF document text
    • http://files.fruitscompassion.com/uploads/1/3/0/7/130775978/2218745.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/1/0428/6211/7020/files/telugu_bible_nighantuvu_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/93287853456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/wuthering_heights_shmoop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/gexuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/rabox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/lightroom_tutorial_beginner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/physiology_of_the_bacterial_cell_a_molecular_approach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0374/8247/files/500_frases_en_ingles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/fazotiwetorutoworajoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/tigatiseloluku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5490 5472 bytes
SHA-256: 5b7ebfeb3ce67742530fbbc1bef1d10728f1dae9b539cc38908d349d78e60353
font_01_sfnt_off000066fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66FA 10872 bytes
SHA-256: 895e3a792bfcb41fc6bcadbd8d660f45f2ab26e366bc9b21f7b760c80c361b35
font_02_sfnt_off00008bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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