Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c1af28f0226d52…

MALICIOUS

PDF

46.3 KB Created: 2020-08-17 12:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c5de07f2e6742ff893dd6a7ae32e12 SHA-1: 7d90b4f1f51136caff149d92850b2f0f29380bc0 SHA-256: 75c1af28f0226d5292ae8112189313e5d48fa063d1e0a48304b096864f60f77d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead users to harmful content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, including one to a known malicious redirector, suggests a phishing or scam attempt.

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.com/pify?keyword=evaporation+experiment+worksheet
    • http://files.indigotheatrical.com/uploads/1/3/2/7/132712315/suborunowawijasezajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2430/9659/files/14684471142.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3351/files/battle_realms_android_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/55382562581.pdf
    • https://cdn.shopify.com/s/files/1/0440/2338/2166/files/manual_capsule_filling_machine_where_to_buy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41697505155.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/35321096104.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/57133649316.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/17476277362.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6232/files/lovosugew.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000709e.bin
c1001938bab985d8a157190f9a925275213ac36c9d35cc17f07def085b9e719f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 5268 bytes
font_01_sfnt_off00008278.bin
f910cd72a6c9236e263089d9ec9f26658dc1972b1921f917f511f99eb0782afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 13228 bytes

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