Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afa102fb3a9b84c…

MALICIOUS

PDF

37.0 KB Created: 2020-09-05 05:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d3712915627cc308cc1cff5a7eafe556 SHA-1: 7ff5e63fc34f050e1c2c2be21bcc9cb3ea912ab2 SHA-256: 5afa102fb3a9b84cd743a6f7685064c8cb3dc8f46226ec3f15b42aa3a57540d6
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.me/wix?keyword=present+continuous+for+future+exercises+with+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/a18aa6_f8719d2ea0be409ebbce4f7545978b68.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b2c09_3d63dfe2c20e4f01a2cd7dd7ad64b776.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87b9a8_97238d52db984fd190f94e0ec213a9d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/30ea26_8a2d33cb1a01439c84beb50dbceda8b4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a4e3ef6c714e46d79401bf9f7593084a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bf07b1_ad063cb3baf24e539112496f1b67cc89.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/954c8b_159c3b36d9d84e2292d518cc185d2b06.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/stargate_atlantis_season_5_episode_18.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/wuwesabofelulifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3752/2082/files/19628539883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/9876/6231/files/securecrt_license_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3252/6238/files/khiladi_bengali_movie_mp4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/bogegokukelezer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/mudejegunetarivuxapiroko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9342/4283/files/kufixamuzubuxujuzovokefur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9910/9016/files/wunijifezojapurime.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_off000050a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50A5 5100 bytes
SHA-256: 53b168ad808fc79dadb48b9a7135918797e18dcee1704b096b4d88c81b734168
font_01_sfnt_off00006212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 10228 bytes
SHA-256: 63298d2af950d7390062f451482da36136aebceed153d23ce2a7db15f54ffb3b

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