Malicious PDF — malware analysis report

Static analysis result for SHA-256 95811023d03348c8…

MALICIOUS

PDF

42.7 KB Created: 2020-11-02 18:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5f17b41913cba7d3175cf17150f19870 SHA-1: d26dea100ea9ec436c2379ea2709be023c330bd9 SHA-256: 95811023d03348c8f99ab2b9c8414bd68dcc455ca815d174291b0b593c4cb9d0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded URLs, many of which point to disposable hosting services and form a link farm. One URL, https://ttraff.ru/123?keyword=unaka+high+school+football, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be to lure users into clicking these links, potentially leading to further malicious content or exploitation.

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.
  • 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.
  • 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.ru/123?keyword=unaka+high+school+football In PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/giwukotejogigo-telufu.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/2164756.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/xiwinewu-rifitarujubi-zoxaxezeto-direbujojiji.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/xugifufewumimibolate.pdfIn PDF document text
    • https://xezuzevujuniz.weebly.com/uploads/1/3/4/5/134586082/davuxinonorij_ximorepogujopil_vekuru_remivom.pdfIn PDF document text
    • https://jujodupif.weebly.com/uploads/1/3/2/3/132303189/zoxifotape-pewusumeba-kogativalawetif.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/1/0483/3712/5529/files/51940075688.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5813/4685/files/latest_version_of_instagram_plus_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76147e82-ae56-499d-bc5a-d1e48df96779/sigeranudajejusevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fc7909-3405-46cc-8760-3e67264d61fa/puloxuxopapilewobuwaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db86915-ba36-4fdb-a9d7-4c3e9e95a0c9/waterfalls_in_virginia_and_west_virginia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/89481683138.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_off00006876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6876 5240 bytes
SHA-256: c4079085209068bf172e9ddb9ff25a581495d585cbca397f38358fb7652f9d43
font_01_sfnt_off00007a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A58 10584 bytes
SHA-256: 549f223d0a06985a9369b5533597ea29103793801d3d2f8ed1c833832818d213

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