Malicious PDF — malware analysis report

Static analysis result for SHA-256 3638021d1522cdc8…

MALICIOUS

PDF

48.7 KB Created: 2020-10-31 10:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 09d6d1f552f29af4bb9da81418230019 SHA-1: 2e193629a3ebe5525619488a515a8c36fe6082b3 SHA-256: 3638021d1522cdc87d5ab4d97a1d76cb9a7d373b11c01aae448e033df82a3c4f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body also contains the URL 'https://cctraff.ru/pify?keyword=exhale+of+the+horned+one+ftb', suggesting an attempt to lure users to a malicious site. The presence of many other PDF links indicates a potential link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=exhale+of+the+horned+one+ftb In PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/zolixedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8bfe34ec755.pdfIn PDF document text
    • https://suzaruluzi.weebly.com/uploads/1/3/4/4/134455671/gafosubojuxum.pdfIn PDF document text
    • https://niliwuwez.weebly.com/uploads/1/3/4/2/134265541/8765231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_5f9cde7126f51.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/f8faa2891b2c.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/b13b3e0dcf.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/1/0429/3427/2159/files/turbo_car_driving_racing_3d_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/jubevopufupenapubume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4540/4327/files/forest_stay_focused_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9126/2123/files/thevenin_equivalent_circuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd10208f-c611-4165-bcfe-f16d890c24f3/13443038853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2844/8933/files/mutik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39af4ee6-f2f1-48d7-9aa4-276866a52761/5257066200.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_off00005c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C51 4720 bytes
SHA-256: 475ee4d20f89a1b8c001d83f43890f074cd57422bc320f9f612a1520f990c183
font_01_sfnt_off00006c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C52 10652 bytes
SHA-256: 8b7ad2c8de689c9bb4f90b7066c3c74bd1feca695a9afc8659c6efaa6fddf6bc
font_02_sfnt_off000090bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BC 16616 bytes
SHA-256: 87bb59e6b957ce6ed7a8fb14ec3281d302c6d7d409fe032fc516675b31191539
font_03_sfnt_off0000a782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA782 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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