Malicious PDF — malware analysis report

Static analysis result for SHA-256 54024258a4c1915f…

MALICIOUS

PDF

33.8 KB Created: 2020-08-23 19:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80113cfc861fdf75389f7f0e99176ba SHA-1: 0a8de43e8c0ca1c6f79f97fbaa8ae39d0d226ef4 SHA-256: 54024258a4c1915f23419353fbaafacd3752c5803ea682589dfcbb6a9b7a254f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=eyes+nose+lips+piano+sheet+easy'. Another heuristic indicated a PDF link farm with 22 external links, many pointing to shopify.com domains. The document body contains garbled text but includes the same malicious URL and a large number of other URLs, suggesting a spam or phishing lure.

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=eyes+nose+lips+piano+sheet+easy
    • http://files.vickiolivesound.com/uploads/1/3/1/0/131070051/mebemas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9622/files/49200867823.pdf
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/wefekifixeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3029/files/adblock_wifi_ios.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/41342907811.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/aerial_photographs.pdf
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/numpy_one_hot.pdf
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/download_buku_biologi_sma_kelas_10_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/24607433517.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/70453320766.pdf
    • https://cdn.shopify.com/s/files/1/0440/3757/0710/files/33832129509.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041aa.bin
6c13547434ef25cbeceae8a5424abd12fd9a34ea6328e909d16f61387c3abf80
pdf-font-stream PDF embedded font (sfnt) at offset 0x41AA 4872 bytes
font_01_sfnt_off00005241.bin
4b5d228bde90f05d393d56d1d906d45b81f79604a3213eb30fc0f79028591cbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5241 12128 bytes