Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e636c98f0bd186…

MALICIOUS

PDF

71.1 KB Created: 2020-08-25 13:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c2f72e8cd3e5e045508af11cfa6bfb SHA-1: 29297d497af3ffe1675e92f31df40a95d05025d7 SHA-256: c5e636c98f0bd1861cf39bbca512f893acc8a5d84e3fa25669de9960d126634d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Another critical heuristic indicates a PDF link farm, with numerous links to shopify.com domains, likely used to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of the malicious redirector URL is the primary indicator of 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=bedingte+formatierung+excel+ganze+zeilen
    • http://sudugoto.electro-yarn.com/uploads/1/3/1/4/131454065/6287967.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/damages_based_agreements_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/dupibafopobijosuforuki.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/detoripotinirogigexuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0449/5484/5352/files/unity_object_pooling.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/wuwafebekufe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5734/files/resume_cover_letter_template_canada.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4716/files/affichage_obligatoire_interdiction_de_vapoter.pdf
    • https://cdn.shopify.com/s/files/1/0435/7180/6366/files/sqlite_python_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/molikolifuvelad.pdf
    • https://cdn.shopify.com/s/files/1/0447/1599/9386/files/aeneid_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/dadewabakebamokesanes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4025/0775/files/feeding_guide_for_gamefowl_chicks.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_off0000d354.bin
072c44e344d97ba5e61268279276ab120835fa327d925e6c603cff8b1d5f6888
pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 5332 bytes
font_01_sfnt_off0000e566.bin
b6d6d094a450e2ca9c489889e91fdbd17a1b994ffa3776a25888117a2a382147
pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 12264 bytes