Malicious PDF — malware analysis report

Static analysis result for SHA-256 de77628e16fcf6b7…

MALICIOUS

PDF

56.8 KB Created: 2020-10-15 11:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: fc01ae5e1635eebc03cddb4737c5b770 SHA-1: c944b1af5d2c26489f9228f12d11d85dea4d1886 SHA-256: de77628e16fcf6b73a0c9533e2aa165088a1b31afad5c2cc545e4c67bbf87a20
132 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/123?keyword=bts+serendipity+full+length+mp3+wapka In PDF document text
    • https://site-1041865.mozfiles.com/files/1041865/62289825636.pdfIn PDF document text
    • https://site-1044157.mozfiles.com/files/1044157/gokepetizaxixiro.pdfIn PDF document text
    • https://site-1040209.mozfiles.com/files/1040209/tufes.pdfIn PDF document text
    • https://site-1042020.mozfiles.com/files/1042020/41050783817.pdfIn PDF document text
    • https://site-1043154.mozfiles.com/files/1043154/fepuwemunuregenabuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f871e868d133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f877b96c2c3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f87f87531b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87fd6023136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87724b26a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f8762f4bfa97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8751266383c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87caefbc591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f8728cfa1061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5f876f48d2ec5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f871a21e12ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f876ef5a8fa5.pdfIn PDF document text
    • https://site-1041579.mozfiles.com/files/1041579/29007078950.pdfIn PDF document text
    • https://site-1041288.mozfiles.com/files/1041288/rexepobafuwemetitino.pdfIn PDF document text
    • https://site-1044103.mozfiles.com/files/1044103/zugubeworibosekurigozov.pdfIn PDF document text
    • https://site-1037262.mozfiles.com/files/1037262/92038047914.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
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59D3 3892 bytes
SHA-256: 32128654e24af907aad92a03c2f1d97b31b4d02c1b0ecb00d43555f036f95e0a
font_01_sfnt_off000067b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B2 5700 bytes
SHA-256: 568f601dfdab933c485e93db8073adede32a19e3f8abd708d27f0d9d2d04409b
font_02_sfnt_off00007af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF1 2448 bytes
SHA-256: d966ccd375f5d79ee45849b8ac84c59a19f80536bf2da1f4abb8ddfd93f24d09
font_03_sfnt_off0000859c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x859C 10424 bytes
SHA-256: 80d9c4dda9de1d039ca7371cc3bdd2b5d00897d609a0083caff77d57e2ba8755
font_04_sfnt_off0000a8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CB 17952 bytes
SHA-256: c8e5ee3f9016e37fd8e76cecf0728c5e67989a1dbff1b89c858b900534af9e60
font_05_sfnt_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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