Malicious PDF — malware analysis report

Static analysis result for SHA-256 d411fdefade8995a…

MALICIOUS

PDF

41.6 KB Created: 2020-08-16 10:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f6beba7ca78d4be6c1a4ca7fc6bf53 SHA-1: dd60f325da83e48c4b98041e4b6ca4a7c4f4429a SHA-256: d411fdefade8995a9198f792ef09ccca4bfce551d94895ad44b915f961bf0e72
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=areas+development+performance+review+examples'. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and a URL that likely serves as a lure or part of a redirection chain.

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=areas+development+performance+review+examples
    • http://files.cowtowncountryclub.com/uploads/1/3/2/7/132741194/pudaxirenabanif.pdf
    • http://tanur.nofilterbydreah.com/uploads/1/3/0/7/130739278/dadiwo_dedukoboz_duxeku.pdf
    • http://files.vibrant-energies.com/uploads/1/3/0/8/130873907/nomadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3979/3050/files/80563941767.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/pharmaceutical_business_management_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/6613/0593/files/49898253102.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/bugdom_2_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1911/files/celta_assignment_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7705/0272/files/ccps_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/ganova.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/university_of_chicago_booth_mba_employment_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/xagasamofapir.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/sujezinozovizumoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6264/files/moninopa.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_off00006447.bin
9b1da096a3bd1adafd21aae9478637f6074a75f8a78379a4f71f61791ff264fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 5512 bytes
font_01_sfnt_off00007704.bin
4e92e9c2fa279a70585e4c5bcbfad156ab1e566c53a91930455949a45795aa54
pdf-font-stream PDF embedded font (sfnt) at offset 0x7704 10124 bytes