Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa11bf2c973b8378…

MALICIOUS

PDF

42.2 KB Created: 2020-09-08 18:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7a9ba9653e2057c93f2c2aa5ab3e300f SHA-1: f08a502acea558f14caaca2ec68a18293fc0c9c8 SHA-256: aa11bf2c973b8378aca8695cc5817091c86ecacb4170034e65c2d00e7ff41b31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a link farm designed to appear as search results for 'camera app for android mobile'. The primary link, 'https://ttraff.link/pify?keyword=camera+app++for+android+mobile', redirects to malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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://ttraff.link/pify?keyword=camera+app++for+android+mobile In 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/1/0428/1594/6911/files/tekigawumelo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/wagitasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/asciidoc_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/sedarojiwak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7691/9200/files/b_v_raman_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/vatabukamike.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/362633_b9864266e40c4960a13ee903c8848110.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7836c9_98ff446d35a247ce866419ef9e959800.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/82e28d_da9c5f682d404ce38f098b1c09e0bf0d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c268c_1caad61bee8a4e3f864dd2a413cb3d78.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/76de1a_4a049f5536de456b9da37ca44a6c9885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6714/5366/files/mupekaramuwemapifexa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/afrikaans_language_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/11130096036.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4765/5323/files/sorujenutuzupodo.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_off00006777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6777 5052 bytes
SHA-256: 81b3142ca6386eb8a570c14ed3b7e3aece99998c0f7579fb4887eaea7aa66ef6
font_01_sfnt_off00007885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7885 10196 bytes
SHA-256: b57c876ee97c2a981946b4a17f138c6e89cf059d0bad7d2be82afbd95f897bbd

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