Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8579887aab6d5e…

MALICIOUS

PDF

50.8 KB Created: 2020-10-16 06:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 66fec3165a01a934d3a725f20ac674c9 SHA-1: e122fd1150874d38df6bfa21d2ca5575fbad6783 SHA-256: 4f8579887aab6d5e9845042a8a0b1197874f31d72d175c325bc51b30826e2ad0
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/pify?keyword=coc+best+private+server+mod+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f88c24e1662a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8731e711968.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/xipeziwefon.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/konumos.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/2441748.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nojof.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/zapolasogeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f88687fe61fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f878b6019b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f874b5e9be14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f88bf78643da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f88d9f10ebcd.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/1/0503/3931/5880/files/55080710853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9983/8358/files/rozeselaxizigez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/terebami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8411/2569/files/besel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8101/0851/files/bao_thang_mo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8055/7755/files/majowujagiwudusosirorex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2925/7122/files/hawaii_state_id_application_for_minors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2737/3981/files/33185450909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/five_nights_at_fuckboys_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/install_android_apk_on_samsung_smart_tv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5145/6411/files/51658874492.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_off000088be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 5356 bytes
SHA-256: 91b85dee4c28d704f9a35e59ac65c925aec9f5b25e2edafc89a1e5c8d9f9eac8
font_01_sfnt_off00009adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ADB 10048 bytes
SHA-256: dd07f70959253ce65eb8b3d393bfa0406bb336f8ca2078b65d18e93d204c0eb8