Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b265dce75eccefd…

MALICIOUS

PDF

48.9 KB Created: 2020-08-14 11:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7ae94c3bfa5844c6fe973cfbf9bb74a SHA-1: 88ef25a86ea1f03b66e26ce5e356a73650bbfe72 SHA-256: 6b265dce75eccefdc9dad71ed0defbf4652a869a225093772d6b6260b53a506e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm, with one critical link identified as a malicious redirector. The document body, though partially obfuscated, includes the same redirector URL. This suggests the primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing.

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=clinical+practice+guidelines+gestational+diabetes+mellitus
    • http://files.sftint.com/uploads/1/3/2/3/132303270/lazoniludex_duguxumigafoxaj.pdf
    • http://files.ivcsudh.com/uploads/1/3/1/3/131379692/lobopizikut.pdf
    • http://munaponek.howlinwolfhounds.com/uploads/1/3/1/1/131164250/zigixabe.pdf
    • http://files.onehumanfamily.org/uploads/1/3/0/9/130969370/dipoje-kixevomit.pdf
    • http://xaver.yubakids.org/uploads/1/3/1/8/131872225/1882490.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/1996_honda_shadow_1100_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6142/files/81408382429.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/96675476565.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/46426423787.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/degobik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5913/4112/files/rivarefadapuvajerok.pdf
    • https://cdn.shopify.com/s/files/1/0440/6509/5845/files/82955428425.pdf
    • https://cdn.shopify.com/s/files/1/0437/8342/2109/files/69218118574.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6647/files/sorujesugazedumunufavema.pdf
    • https://cdn.shopify.com/s/files/1/0431/5178/6135/files/ruvurewojaseda.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_off00008014.bin
858f74c1b0b7c1e5955ce602faa395574ab09145974b4e662009a13179d83b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x8014 5436 bytes
font_01_sfnt_off0000926c.bin
d901caea80de0bcf9ffa3c05b6c2f7d3cf498e7cbd481866710576895017b268
pdf-font-stream PDF embedded font (sfnt) at offset 0x926C 10352 bytes