Malicious PDF — malware analysis report

Static analysis result for SHA-256 265e6f00034b1a89…

MALICIOUS

PDF

62.6 KB Created: 2020-08-04 19:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3d9ab3172fa06f5026f680ac5079071 SHA-1: d98b41f3a12e295c3dd2f329a742177e4a4129d6 SHA-256: 265e6f00034b1a89b5e91f4c349b0d4b1378b7df7b72cd768e874174ca32fad9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a redirector service, which is a common technique for delivering malicious payloads. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a link farm, likely to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly suggests 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.com/pify?keyword=cancer+de+piel+tipos+pdf
    • http://files.joernburmester.de/uploads/1/3/1/1/131164270/5015754.pdf
    • http://files.girlsrockourworldsummercamp.com/uploads/1/3/1/8/131856112/784fe73d5b200c1.pdf
    • http://files.yodopay.com/uploads/1/3/2/3/132303248/1602960.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/business_balance_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/libuxino.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/bailes_tipicos_de_nicaragua.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/cinema_for_spanish_conversation.pdf
    • https://cdn.shopify.com/s/files/1/0440/6283/4853/files/41494209439.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/vudewedazepasugojoletizog.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/sovuwipu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/nifade.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/sopogadadijizifogimi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3361/files/daruwebaxanudeworikij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/25568441200.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_off0000b622.bin
4a39f35e97d2a9cbf7d05f1c657f914c638515800021934cc464ea9c6ccee442
pdf-font-stream PDF embedded font (sfnt) at offset 0xB622 5052 bytes
font_01_sfnt_off0000c75b.bin
2abe460879913da838051e348fe653309ac840b3fbfc1e4567e98c2ca1e9a102
pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 11208 bytes