Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbda917d2ba32e5…

MALICIOUS

PDF

53.5 KB Created: 2020-08-11 13:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ba4037e4c2e0424d758d163e797afc SHA-1: 1fdb64b9fa06373cc8b4f3fe35e81cd0f0d62fd4 SHA-256: 6dbda917d2ba32e54791ff21be53dee2e1c48687e70f1b36168318f47bdffcc1
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL observed is https://ttraff.ru/pify?keyword=biography+of+malayalam+writers+pdf, which is likely used to distribute further payloads or phishing content. The document body itself contains obfuscated text and embedded URLs, suggesting an attempt to disguise the malicious intent.

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=biography+of+malayalam+writers+pdf
    • http://files.justuschildrenbooks.com/uploads/1/3/0/7/130740477/709d4.pdf
    • http://files.nicoleruysschaert.com/uploads/1/3/1/3/131380107/e9523.pdf
    • http://dodir.empoweredgirlssoccer.com/uploads/1/3/0/7/130775868/8947692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4418/1928/files/17968424950.pdf
    • https://cdn.shopify.com/s/files/1/0447/9343/0177/files/nationwide_isa_transfer_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/2655/4781/files/hernia_hiatal_deslizante.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/allianz_arena_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/58630473541.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/55062514853.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/defepolomelalosimupare.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/adjectives_worksheets_for_class_4_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/34103593247.pdf
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/88779777640.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_off00008d75.bin
15c3f95e771bc557478b1fe25529a5607d7cadd06988af9f6754be6d92e7ab1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D75 5700 bytes
font_01_sfnt_off0000a0c6.bin
2866598cb2b84912d0e0b0ccc2c90bbbbdc1f943347bfd814fadce7f6999834f
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C6 12984 bytes