Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50d6655e7f3e561…

MALICIOUS

PDF

48.9 KB Created: 2020-08-13 07:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63817d9bd12eeed8bd929785bbd5889 SHA-1: 80a32569a6038d044b5fd4e1c257d752f12b6f63 SHA-256: a50d6655e7f3e561d35cb507365dfbc66f8b9aa8ca1dd9ba349e89d81ec17af1
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=drager+anaesthesia+machine+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=drager+anaesthesia+machine+pdf
    • http://files.path2wine.com/uploads/1/3/1/3/131379894/vitexes_divirowafa_kadisurawagemod.pdf
    • http://files.wilsonyoungchoir.com/uploads/1/3/2/8/132815791/2adff.pdf
    • http://files.oriolcuadernpuig.com/uploads/1/3/1/6/131606901/b2c26b912.pdf
    • https://cdn.shopify.com/s/files/1/0435/6859/5112/files/33433834713.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/26050253397.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/85804634464.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/wimowewipovuvonubejemud.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/wudakufiwisubifixokimugok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6578/files/benefonunelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5153/files/tepunatopexubosofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tizisixurodegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/jivalolojofupaninigupowuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/verbal_and_nonverbal_communication_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/52619860250.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_off00008247.bin
6ccf1c18d64b3643e1c58e1f1a23ce1c8806905571d3ada850334c773246d1a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8247 5536 bytes
font_01_sfnt_off000094eb.bin
55f4043628e3e1fe75d3d6bb12aa6f8a47f83a737371fd6896b6a1f6137c216f
pdf-font-stream PDF embedded font (sfnt) at offset 0x94EB 10012 bytes