Malicious PDF — malware analysis report

Static analysis result for SHA-256 0327d4be4557b420…

MALICIOUS

PDF

43.8 KB Created: 2020-08-19 15:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 465f409368ac9ab35ba217cdb064dcc4 SHA-1: 1342313367924b4c52e3ea717e9638cbf9fbfeeb SHA-256: 0327d4be4557b420b546b1508064b290ed909c5e38bd926cc8d4c91a748c6b2f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=jazz+guitar+music+sheet+pdf'. The document body, though heavily obfuscated, contains this URL and references to "jazz guitar music sheet pdf", suggesting a lure. The presence of many external PDF links, including benign ones on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the primary malicious link. 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.com/pify?keyword=jazz+guitar+music+sheet+pdf
    • http://files.levyslocks.com/uploads/1/3/0/8/130814342/9d4d8b.pdf
    • http://files.macmccuskerceramics.com/uploads/1/3/1/0/131070722/tobulatunabeso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/vamofexoluzex.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8997/files/adding_and_subtracting_fractions_with_like_and_unlike_denominators.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/15951804020.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/accounting_and_finance_terms_and_definitions.pdf
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/bully_lite_apk_obb.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/pidelizobaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/kewevipakadesawonup.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/81415588423.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5188/files/56151614676.pdf
    • https://cdn.shopify.com/s/files/1/0436/2915/0368/files/43707903215.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/42551061725.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ff0.bin
0cfd98ffd003d18a290ae03820f0c966405856c97a33135a297999c638d5d8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 5244 bytes
font_01_sfnt_off000071c9.bin
126797264f0a4c25e87c93533fe6326c3102e0c48b1d42877f16de9f4e6fdedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C9 10100 bytes
font_02_sfnt_off0000945e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x945E 4324 bytes

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