Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5ff7f9e7d31d3d…

MALICIOUS

PDF

42.6 KB Created: 2020-08-20 03:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c863fd0c2a04393f2e890001b2ae367b SHA-1: e3a279b1c2d71ede15ba79f8c797c5c38cab20e4 SHA-256: 3c5ff7f9e7d31d3d8ceb14c39ef642ff4e4a38db7309b0ab8ef4bad2ef1e8583
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical redirector link to 'ttraff.ru', suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, contains text related to 'contract agreement template uk' and the malicious URL, indicating a lure to entice users to click on the embedded links. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector and link farm.

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=contract+agreement+template+uk
    • http://zuxumomup.diplomainprofessionalstudies.com/uploads/1/3/2/6/132680981/zoleve.pdf
    • http://files.icanbirth.com/uploads/1/3/1/6/131606789/1975292.pdf
    • http://files.shoreliteracy.org/uploads/1/3/0/7/130739559/kezubowi.pdf
    • http://nupasiti.pdxinsectarium.org/uploads/1/3/0/7/130776485/ff7f678fa87.pdf
    • http://guwemovov.californiaconservationoftrails.org/uploads/1/3/2/8/132814097/musujetasevenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/cover_letter_template_doctor.pdf
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/goxugakajunewew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/46214169308.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/kixobimaxujasezepij.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/gimesabedupufenitepezo.pdf
    • https://cdn.shopify.com/s/files/1/0450/6284/8664/files/53058075724.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/clasificacion_taxonomica_de_los_animales_domesticos.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/18537852838.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/14475386339.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/46774857307.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_off00006bad.bin
fbadd782cb554731e7bf9502c927b22241b815c319856516af0770ef57ee2af2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAD 5044 bytes
font_01_sfnt_off00007cbc.bin
c0cb6039dc16eaca6e019b1cda0ce1141f3e65f1bc105461d11ddaa12f52af3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBC 9640 bytes