Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a70c1d48b7fe2a4…

MALICIOUS

PDF

50.1 KB Created: 2020-11-07 19:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2e732551e799d5eee47309f3d03c0d63 SHA-1: 43c49118d070701c1ed0c920f15519629188099c SHA-256: 4a70c1d48b7fe2a428cab88baec60425ed8ed287781603aaab4cff08cbfce367
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?keyword=duel+link+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f881451dd68b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f99d0f075b29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_5f99aa51d6350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5f94728ae83f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f95b0e770302.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/4979305.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudowo/95712474322.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77319ddc-c67c-4c56-b23c-45ed32ae017d/wotoxesesolilu.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/28865620887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82e1e7d-d925-42da-89bf-8621ff96fad8/43841592071.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AB 2996 bytes
SHA-256: 2387869740c16c6be3f014b386c40cc4121a16bfe07b447dca100a57dce8330e
font_01_sfnt_off00006f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F49 4604 bytes
SHA-256: a831eff8b79e4aff0642213f8a720e924c67f15dce80b53c472bd40acb02c1f1
font_02_sfnt_off00007f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0F 11328 bytes
SHA-256: 2ba5a82de3da669d5d56db4f3121719f712c714b5862cf0ebed571ea484407c7
font_03_sfnt_off0000a5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C1 16248 bytes
SHA-256: fbeccb1482ee56052ed809ec6cb7dfbc577d51b9212e43fffabc93e29761b6bf

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