Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e054cea1ba2cd8…

MALICIOUS

PDF

51.0 KB Created: 2020-10-04 05:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 70740230074b2f90503c92b196aafdc7 SHA-1: e4152b9a6a1b405997767594b5e5f823e9d09257 SHA-256: e4e054cea1ba2cd89564a2ca7affa92b4c02d1be8d3e6ae8af0f4081ec724e8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors or part of a link farm. The document body, though partially corrupted, includes a URL that is also flagged as a malicious redirector. This suggests the primary purpose is to direct users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?keyword=mr+bean+animated+theme+song+sheet+music In PDF document text
    • http://sigamili.aarondalbey.org/uploads/1/3/0/7/130740112/5445435.pdfIn PDF document text
    • http://wutufok.omega-m.si/uploads/1/3/2/7/132712127/76502.pdfIn PDF document text
    • http://nelip.joshdipaolo.com/uploads/1/3/1/8/131857054/1f510b4057b1f9.pdfIn PDF document text
    • http://files.roundtuitkitchen.com/uploads/1/3/1/4/131438193/fegegafu_tatuzipakatu_gegurotusebi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31ebec9-c019-441d-8614-6d54dab695a7/bowusopag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9b37ae-f75a-4ce2-8a7f-e920a2f2256e/sipegiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2379/7911/files/california_license_plate_laws_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7909/7248/files/58263048168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/mn_rules_of_evidence_609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8124/4058/files/zajipirosadud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/vukularipux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3876/8793/files/kuwunofeg.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://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 3092 bytes
SHA-256: 1f61c40f5fbb08aa5388548dccbeca2b1d0e0bb6b8ced7f4792cb33e05019460
font_01_sfnt_off00007080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7080 5464 bytes
SHA-256: fa31f55744c960f67146390639e12b16cea024e2d5c7d370629c48db66e32dc6
font_02_sfnt_off000082f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F4 8544 bytes
SHA-256: d1af20eb9605eb8460e4ee0dfbb09c1ca308fb983e1472b7fdb00a9152587f1a
font_03_sfnt_off00009381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9381 13868 bytes
SHA-256: affb5a288327ed7d20d6a98bc65cbdc79cace324d09278f655f89183f5a786ae

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