Malicious PDF — malware analysis report

Static analysis result for SHA-256 a455d6214e94882e…

MALICIOUS

PDF

80.4 KB Created: 2020-11-03 07:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b8a42b74e23888c8f75827560ed3eaad SHA-1: 19f4adf9822ffa67aae04c447584b78adf3b5962 SHA-256: a455d6214e94882e3852ad27644157db0634943a773936817fc009cd90e87c79
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a download button lure further supports a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/aws?keyword=tesol+module+2+quiz+b+answers In PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/d1b716f8e.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/zokuzodidud_bemabozerewir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/227577bf-3d24-4bad-b0cd-971b5506ed3c/49649737468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771044c2-c43c-47e5-bf9f-ba1ee478711e/48883959318.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/12693256951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3c9702-4f2c-424c-b88e-dd90bba6af12/11987060984.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/catalogo_natura_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/94813448995.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c1f0ab-b573-4db1-9dff-86deffaa1655/76443857192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52c626a-c98d-4013-a380-5a063c7774a1/dewafugirogase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c79936-8866-45fe-a5f0-ec0556d877ee/98276156838.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/hygeia_enjoye_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/blowhards_snobs_and_narcissists.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/16479219178.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF210 5260 bytes
SHA-256: c2609f95323b9ea392fcbb1432286ce42f509722edbc7cd0019a354fe79ec3c6
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 10192 bytes
SHA-256: 75f7bb1609537811f79b309366bf5365b1c6d95229402da413e73174697cb0bd
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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