Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d4cdb2293920cf…

MALICIOUS

PDF

42.8 KB Created: 2020-08-20 18:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d6f9a161a91f936399a18f4f046e151 SHA-1: 61bca44acc7097f3b41fe2afaa4872bbe3acec22 SHA-256: 74d4cdb2293920cfe64219e541cb22dd895d3064f8a52c195b690fdd9daa195e
154 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.ru/pify?keyword=basalt+fiber+sheet. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to benign Shopify URLs but one to a suspicious domain, suggests a phishing or redirection scheme. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.ru/pify?keyword=basalt+fiber+sheet
    • http://xonaso.jd3radio.com/uploads/1/3/0/7/130738629/xoziv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/99613788509.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/93693548278.pdf
    • https://cdn.shopify.com/s/files/1/0447/4057/5381/files/pathology_textbook_for_medical_students.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2531/files/43633942278.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/foxit_reader_for_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/fodotugiranipefaguku.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/mupasisakifone.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/kigezugabebunanuwiparepap.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_off000067f4.bin
3710dc430797a039a8eb57f9fadd0a9725f6e496eb1387ba684ca8df1c389a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F4 5044 bytes
font_01_sfnt_off0000790c.bin
efea6c6fe198afa6da1ead91d775e4a3524af2c2b0a3cf57cb9e0955ec9ae2a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790C 11488 bytes

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