Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4beeb4e574234c5…

MALICIOUS

PDF

49.7 KB Created: 2020-08-29 02:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d74d3aa0ec453a84c6a8e1e2701c87c7 SHA-1: ee803648703c1625f2e8f1f2ebc5815f81f86f60 SHA-256: c4beeb4e574234c50d2d1b8c0ff1e7040bef6f2b5ff789ae563e4ed9e146b4b6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wix?keyword=coldplay+something+just+like+this+lyrics+karaoke, which is the primary indicator of malicious intent. This URL likely leads to a phishing or malware distribution site.

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/wix?keyword=coldplay+something+just+like+this+lyrics+karaoke
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/32804488040.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/mekapezezaguvigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/nuwaworugugebukufox.pdf
    • https://cdn.shopify.com/s/files/1/0440/7509/0070/files/8107394326.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d8a4bc43a6140498cef211b3bd3bf4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_00a9562b2044405db30aef232bb75b87.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/65363619583.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/91764909182.pdf
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/losiborinajigigaxunugazat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9799/7991/files/70012242339.pdf
    • https://cdn.shopify.com/s/files/1/0437/4573/8903/files/best_free_spreadsheet_app_ios.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/nacha_file_format_addenda_record.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/daligeke.pdf
    • https://cdn.shopify.com/s/files/1/0432/5549/6866/files/fugipibawafuzaruwikef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/beginners_guide_to_python.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_off000081ea.bin
157752e736f5a77731bf7e437a5217dade813e340d92150e64c5a85a05d0f03b
pdf-font-stream PDF embedded font (sfnt) at offset 0x81EA 5636 bytes
font_01_sfnt_off00009500.bin
a7cfc8eac283788a57d2d71f4f159fba4b9d1d381a4ee7f447adba252f4295f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9500 10800 bytes