Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62643d32badfede…

MALICIOUS

PDF

44.4 KB Created: 2020-09-17 15:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbe78c5af8516b3e913e79a82e291ac3 SHA-1: 92d6675c38595ee965132255d0f36bd1f9b290ed SHA-256: c62643d32badfeded9a22691e1bdc3ecd5da97eedb04219767a002286b8a8ef2
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing to a URL that spoofs a study guide answer key. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. No scripts were extracted from this sample, but the presence of the malicious redirector URL is sufficient to indicate a phishing or social engineering attempt.

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=cookie+unit+study+guide+answer+key+%2528s8p3a
    • http://futoro.escambialatin.com/uploads/1/3/0/7/130740169/7616502.pdf
    • http://kitipu.teachitalian.co.uk/uploads/1/3/1/4/131407386/kikalagomof.pdf
    • http://lemoru.kayleighphotographs.com/uploads/1/3/1/4/131406592/5ad65041360f.pdf
    • http://kapipiwab.pouchlings.com/uploads/1/3/1/4/131407408/zudesotikalokes.pdf
    • http://pedemafe.fasciaclinicasia.com/uploads/1/3/2/3/132302870/5623148.pdf
    • https://b36f3b2c-6ac8-4c44-9e46-94acf02ddb09.filesusr.com/ugd/229b11_f99a94f7a526468696ed9d1ca4253573.pdf?index=true
    • https://f21df550-f8cb-4274-b738-95734d42a280.filesusr.com/ugd/daca0d_e7c64bf43f2847abbc80110ae747c886.pdf?index=true
    • https://23b66f66-2edc-4c7d-aaa6-4ddb9e60ca64.filesusr.com/ugd/b910ae_50e64de98d044f1bba6d0b5d9a1f095f.pdf?index=true
    • https://df2876b9-0a4c-4784-b812-37fa2d936bd9.filesusr.com/ugd/02beb7_d5732d54bc18438e941922482f48f3c8.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/3771/2803/files/1826415044.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/rajifotipafibowebewe.pdf
    • https://e0707182-71af-4a14-902d-deb2e21c8a38.filesusr.com/ugd/3c8574_5e052490ec3c4f5c84a8edd00a7421b5.pdf?index=true
    • https://8a00b2d0-c89e-4268-a4cc-85b936747898.filesusr.com/ugd/03ae60_179fafb6881a4482af9667b223af99a0.pdf?index=true
    • 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_off00006d6c.bin
c2f6a57ca4eb06c84a029911382b8eb880b63e06ec674eb845afe3e81a608670
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6C 5692 bytes
font_01_sfnt_off000080fd.bin
72cca4241941d268310cc703fed66b08b8ae5e75ca008ce613307929267dbe4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x80FD 10564 bytes