Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45080482ecfa1e7…

MALICIOUS

PDF

40.6 KB Created: 2020-08-16 18:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9cca82c7af8502fb80fa5f32cd2c7de SHA-1: 12e4717afab6bcbc75184139fd15ef459ae37707 SHA-256: d45080482ecfa1e77de553778d17732329f18141262c31ed2a9159b978124e4f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a 'professional business analyst cv template' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML 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.ru/pify?keyword=professional+business+analyst+cv+template
    • http://mixuxix.liscenter.org/uploads/1/3/1/0/131071041/xixabamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/soliburesebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/vexisufurulux.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/15968745176.pdf
    • https://cdn.shopify.com/s/files/1/0434/8962/4224/files/24571370766.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/electronics_and_communication_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/masarusibefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/kidibewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/bed_colleges_in_telangana_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7032/files/pick_a_number_between_1_and_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/5455/4533/files/varicela_vacuna.pdf
    • https://cdn.shopify.com/s/files/1/0433/8476/6620/files/49015371839.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0377/files/36632013073.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31995481059.pdf
    • https://cdn.shopify.com/s/files/1/0429/9836/6367/files/igcse_biology_past_papers_download.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_off00006122.bin
71b75165d05e5a1314f1a3388c92746ca3031fa8883d662ae3bf83bb0c5073b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 5464 bytes
font_01_sfnt_off000073a7.bin
24e3b4114c4d4e526cdcb748534dacb561a6dd6f401820ba6954b943ab103331
pdf-font-stream PDF embedded font (sfnt) at offset 0x73A7 9964 bytes