Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36c5b8950f592be…

MALICIOUS

PDF

34.6 KB Created: 2020-08-13 22:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265dc6e508ae094cb27f6ce4e4e1396b SHA-1: 675417e086f77471a72b0d70f768a5fa6b6c93ae SHA-256: a36c5b8950f592be39c2bd4dfd515d723ce121086f05c4609c21074e8fab3bfe
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to a 'Baring frontier markets fund factsheet' and includes the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=baring+frontier+markets+fund+factsheet
    • http://files.thinkgroupindia.com/uploads/1/3/0/7/130776578/4434016.pdf
    • http://wiwemaz.hardinsburgbc.org/uploads/1/3/0/7/130776760/1311845.pdf
    • http://files.5puntocero.net/uploads/1/3/2/3/132303270/zerolasipo.pdf
    • http://ropul.clearpointtechdesign.com/uploads/1/3/1/8/131871433/kimuvigazuber_guxupaseturot_sirozereteb_gegasil.pdf
    • http://files.purbecknewwave.co.uk/uploads/1/3/1/4/131437812/mufusajutujemavime.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7286/files/autocad_commands_list_with_explanation_in_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/62958335390.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/12426326405.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/76694247580.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/10th_class_math_notes_science_group_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2302/2752/files/c_objective_type_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0451/8277/9541/files/web_design_crash_course.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/30647065563.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/28771264347.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_off00004807.bin
a4a9ec61c581cbb3db3249de1117acc59344fc72026ee64e0e447780937ff1d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4807 5516 bytes
font_01_sfnt_off00005aa2.bin
4653ded413f845d6be9e582e967d965ef56c3af815875c5bec14e9935e96ae67
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA2 10300 bytes