Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1643344ff1e350…

MALICIOUS

PDF

45.2 KB Created: 2020-09-13 01:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef73e90f3b7b338e5875cbafa70ab63e SHA-1: 4fbc349e5ce3669f368d878109d9d1fe0fa6b43a SHA-256: 1f1643344ff1e350db5b491ee16bdd7163dcf38fb732087fe05d469917cdd876
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 malicious redirector. The document body, though malformed, contains text related to 'polynomial equations worksheet answers' and includes the primary malicious URL. This suggests the PDF is designed to trick users into clicking malicious links, likely leading to phishing or malware download sites.

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.me/wix?keyword=5-5+practice+solving+polynomial+equations+worksheet+answers
    • http://files.gradeseven.nestmusic.org/uploads/1/3/2/6/132681891/zezipipit.pdf
    • http://files.copyco.ca/uploads/1/3/2/7/132710753/1b5fe11043b.pdf
    • http://konakazer.seawatchingestaca.com/uploads/1/3/1/4/131406082/zusuronuverifat.pdf
    • http://files.tbruederl.com/uploads/1/3/1/4/131437632/xelimemawalibip.pdf
    • http://files.westfieldkitchentour.com/uploads/1/3/1/4/131453902/waremopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/vikajajuval.pdf
    • https://cdn.shopify.com/s/files/1/0436/5769/1294/files/iscfc_footprint_calculator_preparatory_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/acf_pro_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0436/9727/5033/files/hanuman_songs_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/vukivoforaru.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/atrial_septal_defect_types.pdf
    • https://cdn.shopify.com/s/files/1/0457/3862/3132/files/33869623249.pdf
    • https://cdn.shopify.com/s/files/1/0435/0289/5270/files/cancionero_de_uppsala.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/capablanca_chess_fundamentals_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/fort_lauderdale_pier_fishing_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dbe.bin
a3243da8675850c5857d1b902e41688abebb64c6cf3c43c866bab1ff20df3e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 5852 bytes
font_01_sfnt_off000071a5.bin
8346f970ccb8023a073ec7c6269ff5ab49184ba38c99aec2fa1684b0949b90e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A5 9508 bytes
font_02_sfnt_off00009262.bin
c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9262 16060 bytes

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